399156534 has 24 divisors (see below), whose sum is σ = 988387920. Its totient is φ = 114044688.

The previous prime is 399156497. The next prime is 399156539. The reversal of 399156534 is 435651993.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399156534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399156539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1583829 + ... + 1584080.

It is an arithmetic number, because the mean of its divisors is an integer number (41182830).

Almost surely, 2^399156534 is an apocalyptic number.

399156534 is an abundant number, since it is smaller than the sum of its proper divisors (589231386).

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

399156534 is a wasteful number, since it uses less digits than its factorization.

399156534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167924 (or 3167921 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 399156534 is about 19978.9022220942. The cubic root of 399156534 is about 736.2880427284.

The spelling of 399156534 in words is "three hundred ninety-nine million, one hundred fifty-six thousand, five hundred thirty-four".