399425321 has 8 divisors (see below), whose sum is σ = 411115488. Its totient is φ = 387828000.

The previous prime is 399425311. The next prime is 399425347. The reversal of 399425321 is 123524993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399425321 - 2¹⁰ = 399424297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399425311) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14435 + ... + 31736.

It is an arithmetic number, because the mean of its divisors is an integer number (51389436).

Almost surely, 2^399425321 is an apocalyptic number.

It is an amenable number.

399425321 is a deficient number, since it is larger than the sum of its proper divisors (11690167).

399425321 is a wasteful number, since it uses less digits than its factorization.

399425321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46423.

The product of its digits is 58320, while the sum is 38.

The square root of 399425321 is about 19985.6278610405. The cubic root of 399425321 is about 736.4532746877.

The spelling of 399425321 in words is "three hundred ninety-nine million, four hundred twenty-five thousand, three hundred twenty-one".