400531432320 has 96 divisors (see below), whose sum is σ = 1383085122120. Its totient is φ = 106808380416.

The previous prime is 400531432307. The next prime is 400531432331. The reversal of 400531432320 is 23234135004.

400531432320 is a `hidden beast` number, since 4 + 0 + 0 + 5 + 314 + 323 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34762594 + ... + 34774113.

Almost surely, 2^400531432320 is an apocalyptic number.

400531432320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400531432320 is an abundant number, since it is smaller than the sum of its proper divisors (982553689800).

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

400531432320 is a wasteful number, since it uses less digits than its factorization.

400531432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69536732 (or 69536717 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 400531432320 its reverse (23234135004), we get a palindrome (423765567324).

The spelling of 400531432320 in words is "four hundred billion, five hundred thirty-one million, four hundred thirty-two thousand, three hundred twenty".