40644517 has 2 divisors, whose sum is σ = 40644518. Its totient is φ = 40644516.

The previous prime is 40644509. The next prime is 40644529. The reversal of 40644517 is 71544604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40627876 + 16641 = 6374^2 + 129^2 .

It is a cyclic number.

It is not a de Polignac number, because 40644517 - 2³ = 40644509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40644547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20322258 + 20322259.

It is an arithmetic number, because the mean of its divisors is an integer number (20322259).

Almost surely, 2^40644517 is an apocalyptic number.

It is an amenable number.

40644517 is a deficient number, since it is larger than the sum of its proper divisors (1).

40644517 is an equidigital number, since it uses as much as digits as its factorization.

40644517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 40644517 is about 6375.3052475940. The cubic root of 40644517 is about 343.8222586609.

The spelling of 40644517 in words is "forty million, six hundred forty-four thousand, five hundred seventeen".