399425425 has 12 divisors (see below), whose sum is σ = 566043136. Its totient is φ = 273891600.

The previous prime is 399425393. The next prime is 399425441. The reversal of 399425425 is 524524993.

It is not a de Polignac number, because 399425425 - 2⁵ = 399425393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1141041 + ... + 1141390.

Almost surely, 2^399425425 is an apocalyptic number.

399425425 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399425425 is a deficient number, since it is larger than the sum of its proper divisors (166617711).

399425425 is a wasteful number, since it uses less digits than its factorization.

399425425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282448 (or 2282443 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 399425425 is about 19985.6304629101. The cubic root of 399425425 is about 736.4533386055.

The spelling of 399425425 in words is "three hundred ninety-nine million, four hundred twenty-five thousand, four hundred twenty-five".