400431324 has 24 divisors (see below), whose sum is σ = 951970320. Its totient is φ = 130958464.

The previous prime is 400431319. The next prime is 400431337. The reversal of 400431324 is 423134004.

It is a self number, because there is not a number n which added to its sum of digits gives 400431324.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 314169 + ... + 315440.

It is an arithmetic number, because the mean of its divisors is an integer number (39665430).

Almost surely, 2^400431324 is an apocalyptic number.

It is an amenable number.

400431324 is an abundant number, since it is smaller than the sum of its proper divisors (551538996).

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

400431324 is a wasteful number, since it uses less digits than its factorization.

400431324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629669 (or 629667 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 400431324 is about 20010.7801946851. The cubic root of 400431324 is about 737.0710397939.

Adding to 400431324 its reverse (423134004), we get a palindrome (823565328).

The spelling of 400431324 in words is "four hundred million, four hundred thirty-one thousand, three hundred twenty-four".