399692225 has 12 divisors (see below), whose sum is σ = 496192944. Its totient is φ = 319383120.

The previous prime is 399692213. The next prime is 399692233. The reversal of 399692225 is 522296993.

It is not a de Polignac number, because 399692225 - 2²⁴ = 382915009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399692225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13862 + ... + 31488.

It is an arithmetic number, because the mean of its divisors is an integer number (41349412).

Almost surely, 2^399692225 is an apocalyptic number.

It is an amenable number.

399692225 is a deficient number, since it is larger than the sum of its proper divisors (96500719).

399692225 is a wasteful number, since it uses less digits than its factorization.

399692225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18544 (or 18539 counting only the distinct ones).

The product of its digits is 524880, while the sum is 47.

The square root of 399692225 is about 19992.3041443451. The cubic root of 399692225 is about 736.6172757733.

The spelling of 399692225 in words is "three hundred ninety-nine million, six hundred ninety-two thousand, two hundred twenty-five".