399012 has 24 divisors (see below), whose sum is σ = 954912. Its totient is φ = 129600.

The previous prime is 398989. The next prime is 399023. The reversal of 399012 is 210993.

It is a happy number.

It is a super-2 number, since 2×399012² = 318421152288, which contains 22 as substring.

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, 87 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (39788).

2³⁹⁹⁰¹² is an apocalyptic number.

It is an amenable number.

399012 is an abundant number, since it is smaller than the sum of its proper divisors (555900).

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

399012 is a wasteful number, since it uses less digits than its factorization.

399012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 399012 is about 631.6739665365. The cubic root of 399012 is about 73.6199162390.

It can be divided in two parts, 39901 and 2, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 399012 in words is "three hundred ninety-nine thousand, twelve".