400131232 has 24 divisors (see below), whose sum is σ = 788356800. Its totient is φ = 199913664.

The previous prime is 400131223. The next prime is 400131293. The reversal of 400131232 is 232131004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46569 + ... + 54487.

It is an arithmetic number, because the mean of its divisors is an integer number (32848200).

Almost surely, 2^400131232 is an apocalyptic number.

It is an amenable number.

400131232 is a deficient number, since it is larger than the sum of its proper divisors (388225568).

400131232 is a wasteful number, since it uses less digits than its factorization.

400131232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9508 (or 9500 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400131232 is about 20003.2805309529. The cubic root of 400131232 is about 736.8868680547.

Adding to 400131232 its reverse (232131004), we get a palindrome (632262236).

The spelling of 400131232 in words is "four hundred million, one hundred thirty-one thousand, two hundred thirty-two".