399086225 has 24 divisors (see below), whose sum is σ = 528424512. Its totient is φ = 298267200.

The previous prime is 399086221. The next prime is 399086257. The reversal of 399086225 is 522680993.

It is not a de Polignac number, because 399086225 - 2² = 399086221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399086221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16655 + ... + 32795.

It is an arithmetic number, because the mean of its divisors is an integer number (22017688).

Almost surely, 2^399086225 is an apocalyptic number.

It is an amenable number.

399086225 is a deficient number, since it is larger than the sum of its proper divisors (129338287).

399086225 is a wasteful number, since it uses less digits than its factorization.

399086225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16217 (or 16212 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 399086225 is about 19977.1425634398. The cubic root of 399086225 is about 736.2448093004.

The spelling of 399086225 in words is "three hundred ninety-nine million, eighty-six thousand, two hundred twenty-five".