399778896 has 40 divisors (see below), whose sum is σ = 1126651104. Its totient is φ = 121144960.

The previous prime is 399778889. The next prime is 399778901. The reversal of 399778896 is 698877993.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378051 + ... + 379106.

Almost surely, 2^399778896 is an apocalyptic number.

It is an amenable number.

399778896 is an abundant number, since it is smaller than the sum of its proper divisors (726872208).

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

399778896 is a wasteful number, since it uses less digits than its factorization.

399778896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757179 (or 757173 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 66.

The square root of 399778896 is about 19994.4716359298. The cubic root of 399778896 is about 736.6705156896.

The spelling of 399778896 in words is "three hundred ninety-nine million, seven hundred seventy-eight thousand, eight hundred ninety-six".