400800367644 has 24 divisors (see below), whose sum is σ = 936090707328. Its totient is φ = 133473001200.

The previous prime is 400800367631. The next prime is 400800367651. The reversal of 400800367644 is 446763008004.

It is a super-2 number, since 2×400800367644² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400800367596 and 400800367605.

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, 15877032 + ... + 15902255.

It is an arithmetic number, because the mean of its divisors is an integer number (39003779472).

Almost surely, 2^400800367644 is an apocalyptic number.

It is an amenable number.

400800367644 is an abundant number, since it is smaller than the sum of its proper divisors (535290339684).

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

400800367644 is a wasteful number, since it uses less digits than its factorization.

400800367644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31780345 (or 31780343 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 400800367644 in words is "four hundred billion, eight hundred million, three hundred sixty-seven thousand, six hundred forty-four".