40172978937 has 48 divisors (see below), whose sum is σ = 67132739520. Its totient is φ = 21180475008.

The previous prime is 40172978933. The next prime is 40172978941. The reversal of 40172978937 is 73987927104.

It is an interprime number because it is at equal distance from previous prime (40172978933) and next prime (40172978941).

It is not a de Polignac number, because 40172978937 - 2² = 40172978933 is a prime.

It is a super-2 number, since 2×40172978937² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40172978933) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6473278 + ... + 6479480.

It is an arithmetic number, because the mean of its divisors is an integer number (1398598740).

Almost surely, 2^40172978937 is an apocalyptic number.

It is an amenable number.

40172978937 is a deficient number, since it is larger than the sum of its proper divisors (26959760583).

40172978937 is a wasteful number, since it uses less digits than its factorization.

40172978937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622 (or 9615 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 57.

The spelling of 40172978937 in words is "forty billion, one hundred seventy-two million, nine hundred seventy-eight thousand, nine hundred thirty-seven".