13640944 has 10 divisors (see below), whose sum is σ = 26429360. Its totient is φ = 6820464.

The previous prime is 13640911. The next prime is 13640947. The reversal of 13640944 is 44904631.

It is a super-2 number, since 2×13640944² = 372150706422272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426264 + ... + 426295.

It is an arithmetic number, because the mean of its divisors is an integer number (2642936).

Almost surely, 2^13640944 is an apocalyptic number.

It is an amenable number.

13640944 is a deficient number, since it is larger than the sum of its proper divisors (12788416).

13640944 is an equidigital number, since it uses as much as digits as its factorization.

13640944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852567 (or 852561 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 13640944 is about 3693.3648614779. The cubic root of 13640944 is about 238.9359374993.

The spelling of 13640944 in words is "thirteen million, six hundred forty thousand, nine hundred forty-four".