399225057 has 16 divisors (see below), whose sum is σ = 663647232. Its totient is φ = 207389520.

The previous prime is 399225041. The next prime is 399225109. The reversal of 399225057 is 750522993.

It is not a de Polignac number, because 399225057 - 2⁴ = 399225041 is a prime.

It is a super-2 number, since 2×399225057² = 318761292273306498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399225557) 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, 863893 + ... + 864354.

It is an arithmetic number, because the mean of its divisors is an integer number (41477952).

Almost surely, 2^399225057 is an apocalyptic number.

It is an amenable number.

399225057 is a deficient number, since it is larger than the sum of its proper divisors (264422175).

399225057 is a wasteful number, since it uses less digits than its factorization.

399225057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728268.

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 399225057 is about 19980.6170325143. The cubic root of 399225057 is about 736.3301730494.

It can be divided in two parts, 399 and 225057, that added together give a triangular number (225456 = T₆₇₁).

The spelling of 399225057 in words is "three hundred ninety-nine million, two hundred twenty-five thousand, fifty-seven".