399355725 has 12 divisors (see below), whose sum is σ = 660268256. Its totient is φ = 212989680.

The previous prime is 399355681. The next prime is 399355741. The reversal of 399355725 is 527553993.

It is not a de Polignac number, because 399355725 - 2⁸ = 399355469 is a prime.

It is a Duffinian number.

It is a congruent 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, 2662297 + ... + 2662446.

Almost surely, 2^399355725 is an apocalyptic number.

It is an amenable number.

399355725 is a deficient number, since it is larger than the sum of its proper divisors (260912531).

399355725 is a wasteful number, since it uses less digits than its factorization.

399355725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324756 (or 5324751 counting only the distinct ones).

The product of its digits is 1275750, while the sum is 48.

The square root of 399355725 is about 19983.8866339859. The cubic root of 399355725 is about 736.4104989158.

The spelling of 399355725 in words is "three hundred ninety-nine million, three hundred fifty-five thousand, seven hundred twenty-five".