400404324402 has 24 divisors (see below), whose sum is σ = 868971956736. Its totient is φ = 133248222936.

The previous prime is 400404324379. The next prime is 400404324403. The reversal of 400404324402 is 204423404004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400404324403) by changing a digit.

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, 18312538 + ... + 18334389.

It is an arithmetic number, because the mean of its divisors is an integer number (36207164864).

Almost surely, 2^400404324402 is an apocalyptic number.

400404324402 is an abundant number, since it is smaller than the sum of its proper divisors (468567632334).

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

400404324402 is a wasteful number, since it uses less digits than its factorization.

400404324402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36647542 (or 36647539 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 400404324402 its reverse (204423404004), we get a palindrome (604827728406).

The spelling of 400404324402 in words is "four hundred billion, four hundred four million, three hundred twenty-four thousand, four hundred two".