400122991648 has 24 divisors (see below), whose sum is σ = 787842692028. Its totient is φ = 200035958784.

The previous prime is 400122991549. The next prime is 400122991669. The reversal of 400122991648 is 846199221004.

It can be written as a sum of positive squares in 2 ways, for example, as 338831096464 + 61291895184 = 582092^2 + 247572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400122991598 and 400122991607.

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, 542161 + ... + 1046032.

Almost surely, 2^400122991648 is an apocalyptic number.

It is an amenable number.

400122991648 is a deficient number, since it is larger than the sum of its proper divisors (387719700380).

400122991648 is a wasteful number, since it uses less digits than its factorization.

400122991648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596076 (or 1596068 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 400122991648 in words is "four hundred billion, one hundred twenty-two million, nine hundred ninety-one thousand, six hundred forty-eight".