399635676 has 72 divisors (see below), whose sum is σ = 1108808064. Its totient is φ = 120356640.

The previous prime is 399635669. The next prime is 399635723. The reversal of 399635676 is 676536993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63111 + ... + 69153.

It is an arithmetic number, because the mean of its divisors is an integer number (15400112).

Almost surely, 2^399635676 is an apocalyptic number.

399635676 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 399635676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554404032).

399635676 is an abundant number, since it is smaller than the sum of its proper divisors (709172388).

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

399635676 is a wasteful number, since it uses less digits than its factorization.

399635676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231 (or 6226 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 54.

The square root of 399635676 is about 19990.8898251178. The cubic root of 399635676 is about 736.5825349300.

The spelling of 399635676 in words is "three hundred ninety-nine million, six hundred thirty-five thousand, six hundred seventy-six".