40000636044 has 36 divisors (see below), whose sum is σ = 101122637616. Its totient is φ = 13332237408.

The previous prime is 40000636043. The next prime is 40000636051. The reversal of 40000636044 is 44063600004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 40000635999 and 40000636017.

It is not an unprimeable number, because it can be changed into a prime (40000636043) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 360982 + ... + 458594.

It is an arithmetic number, because the mean of its divisors is an integer number (2808962156).

Almost surely, 2^40000636044 is an apocalyptic number.

It is an amenable number.

40000636044 is an abundant number, since it is smaller than the sum of its proper divisors (61122001572).

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

40000636044 is a wasteful number, since it uses less digits than its factorization.

40000636044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109006 (or 109001 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The spelling of 40000636044 in words is "forty billion, six hundred thirty-six thousand, forty-four".