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BaseRepresentation
bin10100011001000
3112022200
42203020
5313230
6120200
742303
oct24310
915280
1010440
117931
126060
1349a1
143b3a
153160
hex28c8

10440 has 48 divisors (see below), whose sum is σ = 35100. Its totient is φ = 2688.

The previous prime is 10433. The next prime is 10453. The reversal of 10440 is 4401.

Adding to 10440 its reverse (4401), we get a palindrome (14841).

It can be divided in two parts, 104 and 40, that added together give a square (144 = 122).

10440 = T11 + T12 + ... + T39.

10440 is a nontrivial binomial coefficient, being equal to C(145, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 10404 + 36 = 102^2 + 6^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

10440 is an undulating number in base 12.

It is an unprimeable number.

10440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346 + ... + 374.

210440 is an apocalyptic number.

10440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10440 is the 144-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17550).

10440 is an abundant number, since it is smaller than the sum of its proper divisors (24660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10440 is a wasteful number, since it uses less digits than its factorization.

10440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 10440 is about 102.1763181956. The cubic root of 10440 is about 21.8558062931.

The spelling of 10440 in words is "ten thousand, four hundred forty", and thus it is an iban number.