399072825 has 60 divisors (see below), whose sum is σ = 743178128. Its totient is φ = 212576400.

The previous prime is 399072811. The next prime is 399072833. The reversal of 399072825 is 528270993.

It is not a de Polignac number, because 399072825 - 2⁶ = 399072761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 491670 + ... + 492480.

Almost surely, 2^399072825 is an apocalyptic number.

It is an amenable number.

399072825 is a deficient number, since it is larger than the sum of its proper divisors (344105303).

399072825 is an frugal number, since it uses more digits than its factorization.

399072825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 399072825 is about 19976.8071773244. The cubic root of 399072825 is about 736.2365689835.

The spelling of 399072825 in words is "three hundred ninety-nine million, seventy-two thousand, eight hundred twenty-five".