399198456 has 192 divisors, whose sum is σ = 1187877600. Its totient is φ = 125411328.

The previous prime is 399198433. The next prime is 399198469. The reversal of 399198456 is 654891993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4115400 + ... + 4115496.

Almost surely, 2^399198456 is an apocalyptic number.

399198456 is a gapful number since it is divisible by the number (36) 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 399198456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593938800).

399198456 is an abundant number, since it is smaller than the sum of its proper divisors (788679144).

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

399198456 is a wasteful number, since it uses less digits than its factorization.

399198456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 204 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 399198456 is about 19979.9513512921. The cubic root of 399198456 is about 736.3138184030.

The spelling of 399198456 in words is "three hundred ninety-nine million, one hundred ninety-eight thousand, four hundred fifty-six".