399218412 has 24 divisors (see below), whose sum is σ = 986304816. Its totient is φ = 125244928.

The previous prime is 399218389. The next prime is 399218431. The reversal of 399218412 is 214812993.

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, 978273 + ... + 978680.

It is an arithmetic number, because the mean of its divisors is an integer number (41096034).

Almost surely, 2^399218412 is an apocalyptic number.

It is an amenable number.

399218412 is an abundant number, since it is smaller than the sum of its proper divisors (587086404).

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

399218412 is a wasteful number, since it uses less digits than its factorization.

399218412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956977 (or 1956975 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 399218412 is about 19980.4507456664. The cubic root of 399218412 is about 736.3260876837.

The spelling of 399218412 in words is "three hundred ninety-nine million, two hundred eighteen thousand, four hundred twelve".