40001999972 has 12 divisors (see below), whose sum is σ = 76367454576. Its totient is φ = 18182727240.

The previous prime is 40001999971. The next prime is 40001999977. The reversal of 40001999972 is 27999910004.

It is a self number, because there is not a number n which added to its sum of digits gives 40001999972.

It is not an unprimeable number, because it can be changed into a prime (40001999971) 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 3 ways as a sum of consecutive naturals, for example, 454568138 + ... + 454568225.

It is an arithmetic number, because the mean of its divisors is an integer number (6363954548).

Almost surely, 2^40001999972 is an apocalyptic number.

It is an amenable number.

40001999972 is a deficient number, since it is larger than the sum of its proper divisors (36365454604).

40001999972 is a wasteful number, since it uses less digits than its factorization.

40001999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909136378 (or 909136376 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 50.

The spelling of 40001999972 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred seventy-two".