40386077721 has 24 divisors (see below), whose sum is σ = 63644971104. Its totient is φ = 24473986560.

The previous prime is 40386077671. The next prime is 40386077737. The reversal of 40386077721 is 12777068304.

40386077721 is a `hidden beast` number, since 4 + 0 + 38 + 607 + 7 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 40386077721 - 2⁶ = 40386077657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40386077021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1947610 + ... + 1968236.

It is an arithmetic number, because the mean of its divisors is an integer number (2651873796).

Almost surely, 2^40386077721 is an apocalyptic number.

It is an amenable number.

40386077721 is a deficient number, since it is larger than the sum of its proper divisors (23258893383).

40386077721 is a wasteful number, since it uses less digits than its factorization.

40386077721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40421 (or 40418 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 40386077721 in words is "forty billion, three hundred eighty-six million, seventy-seven thousand, seven hundred twenty-one".