400297323264 has 144 divisors (see below), whose sum is σ = 1078823854080. Its totient is φ = 131758366720.

The previous prime is 400297323259. The next prime is 400297323317. The reversal of 400297323264 is 462323792004.

It is a super-2 number, since 2×400297323264² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20086297 + ... + 20106215.

It is an arithmetic number, because the mean of its divisors is an integer number (7491832320).

Almost surely, 2^400297323264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400297323264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (539411927040).

400297323264 is an abundant number, since it is smaller than the sum of its proper divisors (678526530816).

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

400297323264 is a wasteful number, since it uses less digits than its factorization.

400297323264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20266 (or 20252 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 42.

The spelling of 400297323264 in words is "four hundred billion, two hundred ninety-seven million, three hundred twenty-three thousand, two hundred sixty-four".