13640344 has 16 divisors (see below), whose sum is σ = 25681320. Its totient is φ = 6792000.

The previous prime is 13640339. The next prime is 13640351. The reversal of 13640344 is 44304631.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389 + ... + 5404.

Almost surely, 2^13640344 is an apocalyptic number.

It is an amenable number.

13640344 is a deficient number, since it is larger than the sum of its proper divisors (12040976).

13640344 is a wasteful number, since it uses less digits than its factorization.

13640344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050 (or 7046 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 13640344 is about 3693.2836338413. The cubic root of 13640344 is about 238.9324342309.

Adding to 13640344 its reverse (44304631), we get a palindrome (57944975).

The spelling of 13640344 in words is "thirteen million, six hundred forty thousand, three hundred forty-four".