399212125506 has 16 divisors (see below), whose sum is σ = 887138056800. Its totient is φ = 133070708484.

The previous prime is 399212125457. The next prime is 399212125541. The reversal of 399212125506 is 605521212993.

399212125506 is a `hidden beast` number, since 3 + 9 + 9 + 2 + 12 + 125 + 506 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696408516 + ... + 3696408623.

It is an arithmetic number, because the mean of its divisors is an integer number (55446128550).

Almost surely, 2^399212125506 is an apocalyptic number.

399212125506 is an abundant number, since it is smaller than the sum of its proper divisors (487925931294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399212125506 is a wasteful number, since it uses less digits than its factorization.

399212125506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392817150 (or 7392817144 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 399212125506 in words is "three hundred ninety-nine billion, two hundred twelve million, one hundred twenty-five thousand, five hundred six".