40400404002 has 24 divisors (see below), whose sum is σ = 100039095936. Its totient is φ = 11542972536.

The previous prime is 40400403941. The next prime is 40400404019. The reversal of 40400404002 is 20040400404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 160318938 + ... + 160319189.

It is an arithmetic number, because the mean of its divisors is an integer number (4168295664).

Almost surely, 2^40400404002 is an apocalyptic number.

40400404002 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

40400404002 is an abundant number, since it is smaller than the sum of its proper divisors (59638691934).

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

40400404002 is a wasteful number, since it uses less digits than its factorization.

40400404002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320638142 (or 320638139 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 40400404002 its reverse (20040400404), we get a palindrome (60440804406).

The spelling of 40400404002 in words is "forty billion, four hundred million, four hundred four thousand, two".