399321792 has 112 divisors (see below), whose sum is σ = 1181404800. Its totient is φ = 132261120.

The previous prime is 399321787. The next prime is 399321859. The reversal of 399321792 is 297123993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308667 + ... + 309957.

Almost surely, 2^399321792 is an apocalyptic number.

399321792 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399321792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590702400).

399321792 is an abundant number, since it is smaller than the sum of its proper divisors (782083008).

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

399321792 is a wasteful number, since it uses less digits than its factorization.

399321792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1475 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 399321792 is about 19983.0376069305. The cubic root of 399321792 is about 736.3896408824.

The spelling of 399321792 in words is "three hundred ninety-nine million, three hundred twenty-one thousand, seven hundred ninety-two".