399218712 has 64 divisors (see below), whose sum is σ = 1020055680. Its totient is φ = 130171392.

The previous prime is 399218711. The next prime is 399218719. The reversal of 399218712 is 217812993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399218711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212208 + ... + 214080.

It is an arithmetic number, because the mean of its divisors is an integer number (15938370).

Almost surely, 2^399218712 is an apocalyptic number.

It is an amenable number.

399218712 is an abundant number, since it is smaller than the sum of its proper divisors (620836968).

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

399218712 is a wasteful number, since it uses less digits than its factorization.

399218712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2068 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 399218712 is about 19980.4582530031. The cubic root of 399218712 is about 736.3262721255.

The spelling of 399218712 in words is "three hundred ninety-nine million, two hundred eighteen thousand, seven hundred twelve".