10081440 has 72 divisors (see below), whose sum is σ = 34407828. Its totient is φ = 2688000.

The previous prime is 10081439. The next prime is 10081447. The reversal of 10081440 is 4418001.

It can be written as a sum of positive squares in 2 ways, for example, as 9960336 + 121104 = 3156^2 + 348^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (10081447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2061 + ... + 4940.

Almost surely, 2^10081440 is an apocalyptic number.

10081440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10081440 is an abundant number, since it is smaller than the sum of its proper divisors (24326388).

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

10081440 is a wasteful number, since it uses less digits than its factorization.

10081440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022 (or 7011 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 10081440 is about 3175.1283438627. The cubic root of 10081440 is about 216.0267456593.

Adding to 10081440 its reverse (4418001), we get a palindrome (14499441).

The spelling of 10081440 in words is "ten million, eighty-one thousand, four hundred forty".