39924285 has 16 divisors (see below), whose sum is σ = 63960000. Its totient is φ = 21265920.

The previous prime is 39924281. The next prime is 39924293. The reversal of 39924285 is 58242993.

It is not a de Polignac number, because 39924285 - 2² = 39924281 is a prime.

It is a super-2 number, since 2×39924285² = 3187897065522450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39924281) 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, 17670 + ... + 19800.

It is an arithmetic number, because the mean of its divisors is an integer number (3997500).

Almost surely, 2^39924285 is an apocalyptic number.

It is an amenable number.

39924285 is a deficient number, since it is larger than the sum of its proper divisors (24035715).

39924285 is a wasteful number, since it uses less digits than its factorization.

39924285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388.

The product of its digits is 155520, while the sum is 42.

The square root of 39924285 is about 6318.5666887357. The cubic root of 39924285 is about 341.7792683261.

The spelling of 39924285 in words is "thirty-nine million, nine hundred twenty-four thousand, two hundred eighty-five".