13423540 has 48 divisors (see below), whose sum is σ = 32154192. Its totient is φ = 4663296.

The previous prime is 13423537. The next prime is 13423541. The reversal of 13423540 is 4532431.

It can be written as a sum of positive squares in 8 ways, for example, as 71824 + 13351716 = 268^2 + 3654^2 .

It is a super-2 number, since 2×13423540² = 360382852263200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13423541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2902 + ... + 5938.

It is an arithmetic number, because the mean of its divisors is an integer number (669879).

Almost surely, 2^13423540 is an apocalyptic number.

13423540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13423540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16077096).

13423540 is an abundant number, since it is smaller than the sum of its proper divisors (18730652).

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

13423540 is a wasteful number, since it uses less digits than its factorization.

13423540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3074 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 13423540 is about 3663.8149516590. The cubic root of 13423540 is about 237.6597779886.

Adding to 13423540 its reverse (4532431), we get a palindrome (17955971).

The spelling of 13423540 in words is "thirteen million, four hundred twenty-three thousand, five hundred forty".