399911776 has 72 divisors (see below), whose sum is σ = 871751160. Its totient is φ = 180449280.

The previous prime is 399911761. The next prime is 399911783. The reversal of 399911776 is 677119993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 692800 + ... + 693376.

It is an arithmetic number, because the mean of its divisors is an integer number (12107655).

Almost surely, 2^399911776 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 399911776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435875580).

399911776 is an abundant number, since it is smaller than the sum of its proper divisors (471839384).

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

399911776 is a wasteful number, since it uses less digits than its factorization.

399911776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 769 counting only the distinct ones).

The product of its digits is 642978, while the sum is 52.

The square root of 399911776 is about 19997.7942783698. The cubic root of 399911776 is about 736.7521257459.

The spelling of 399911776 in words is "three hundred ninety-nine million, nine hundred eleven thousand, seven hundred seventy-six".