399142392 has 128 divisors (see below), whose sum is σ = 1118880000. Its totient is φ = 117642240.

The previous prime is 399142363. The next prime is 399142411. The reversal of 399142392 is 293241993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2678734 + ... + 2678882.

It is an arithmetic number, because the mean of its divisors is an integer number (8741250).

Almost surely, 2^399142392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399142392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559440000).

399142392 is an abundant number, since it is smaller than the sum of its proper divisors (719737608).

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

399142392 is a wasteful number, since it uses less digits than its factorization.

399142392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 377 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 399142392 is about 19978.5482956095. The cubic root of 399142392 is about 736.2793471352.

The spelling of 399142392 in words is "three hundred ninety-nine million, one hundred forty-two thousand, three hundred ninety-two".