399225015 has 24 divisors (see below), whose sum is σ = 790846368. Its totient is φ = 182502720.

The previous prime is 399225011. The next prime is 399225041. The reversal of 399225015 is 510522993.

It is a happy number.

399225015 is a `hidden beast` number, since 399 + 2 + 250 + 15 = 666.

It is not a de Polignac number, because 399225015 - 2² = 399225011 is a prime.

It is a super-2 number, since 2×399225015² = 318761225203500450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399225011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 633376 + ... + 634005.

It is an arithmetic number, because the mean of its divisors is an integer number (32951932).

Almost surely, 2^399225015 is an apocalyptic number.

399225015 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

399225015 is a deficient number, since it is larger than the sum of its proper divisors (391621353).

399225015 is a wasteful number, since it uses less digits than its factorization.

399225015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267399 (or 1267396 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 399225015 is about 19980.6159814957. The cubic root of 399225015 is about 736.3301472279.

The spelling of 399225015 in words is "three hundred ninety-nine million, two hundred twenty-five thousand, fifteen".