15640949 has 16 divisors (see below), whose sum is σ = 16695360. Its totient is φ = 14636160.

The previous prime is 15640927. The next prime is 15640987. The reversal of 15640949 is 94904651.

It is a cyclic number.

It is not a de Polignac number, because 15640949 - 2⁸ = 15640693 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175697 + ... + 175785.

It is an arithmetic number, because the mean of its divisors is an integer number (1043460).

Almost surely, 2^15640949 is an apocalyptic number.

It is an amenable number.

15640949 is a deficient number, since it is larger than the sum of its proper divisors (1054411).

15640949 is an equidigital number, since it uses as much as digits as its factorization.

15640949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 15640949 is about 3954.8639673192. The cubic root of 15640949 is about 250.0850324080.

The spelling of 15640949 in words is "fifteen million, six hundred forty thousand, nine hundred forty-nine".