400778764 has 12 divisors (see below), whose sum is σ = 706008688. Its totient is φ = 199062000.

The previous prime is 400778759. The next prime is 400778801. The reversal of 400778764 is 467877004.

It is a self number, because there is not a number n which added to its sum of digits gives 400778764.

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, 331167 + ... + 332374.

Almost surely, 2^400778764 is an apocalyptic number.

It is an amenable number.

400778764 is a deficient number, since it is larger than the sum of its proper divisors (305229924).

400778764 is a wasteful number, since it uses less digits than its factorization.

400778764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663696 (or 663694 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 43.

The square root of 400778764 is about 20019.4596330670. The cubic root of 400778764 is about 737.2841549328.

It can be divided in two parts, 40077 and 8764, that added together give a square (48841 = 221²).

The spelling of 400778764 in words is "four hundred million, seven hundred seventy-eight thousand, seven hundred sixty-four".