400387221324 has 36 divisors (see below), whose sum is σ = 1039443705664. Its totient is φ = 129855314592.

The previous prime is 400387221319. The next prime is 400387221341. The reversal of 400387221324 is 423122783004.

It is a happy number.

400387221324 is a `hidden beast` number, since 40 + 0 + 387 + 2 + 213 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150294172 + ... + 150296835.

Almost surely, 2^400387221324 is an apocalyptic number.

It is an amenable number.

400387221324 is an abundant number, since it is smaller than the sum of its proper divisors (639056484340).

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

400387221324 is a wasteful number, since it uses less digits than its factorization.

400387221324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300591054 (or 300591049 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 400387221324 in words is "four hundred billion, three hundred eighty-seven million, two hundred twenty-one thousand, three hundred twenty-four".