39957315 has 16 divisors (see below), whose sum is σ = 64010400. Its totient is φ = 21284352.

The previous prime is 39957311. The next prime is 39957343. The reversal of 39957315 is 51375993.

It is a happy number.

It is not a de Polignac number, because 39957315 - 2² = 39957311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39957311) 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, 21441 + ... + 23229.

It is an arithmetic number, because the mean of its divisors is an integer number (4000650).

Almost surely, 2^39957315 is an apocalyptic number.

39957315 is a deficient number, since it is larger than the sum of its proper divisors (24053085).

39957315 is a wasteful number, since it uses less digits than its factorization.

39957315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286.

The product of its digits is 127575, while the sum is 42.

The square root of 39957315 is about 6321.1798740425. The cubic root of 39957315 is about 341.8734954988.

The spelling of 39957315 in words is "thirty-nine million, nine hundred fifty-seven thousand, three hundred fifteen".