400065776 has 20 divisors (see below), whose sum is σ = 845593944. Its totient is φ = 181848000.

The previous prime is 400065763. The next prime is 400065781. The reversal of 400065776 is 677560004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1136375 + ... + 1136726.

Almost surely, 2^400065776 is an apocalyptic number.

It is an amenable number.

400065776 is an abundant number, since it is smaller than the sum of its proper divisors (445528168).

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

400065776 is a wasteful number, since it uses less digits than its factorization.

400065776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273120 (or 2273114 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 400065776 is about 20001.6443324043. The cubic root of 400065776 is about 736.8466843239.

The spelling of 400065776 in words is "four hundred million, sixty-five thousand, seven hundred seventy-six".