40646657 has 2 divisors, whose sum is σ = 40646658. Its totient is φ = 40646656.

The previous prime is 40646651. The next prime is 40646663. The reversal of 40646657 is 75664604.

It is a balanced prime because it is at equal distance from previous prime (40646651) and next prime (40646663).

It can be written as a sum of positive squares in only one way, i.e., 27133681 + 13512976 = 5209^2 + 3676^2 .

It is a cyclic number.

It is not a de Polignac number, because 40646657 - 2⁸ = 40646401 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40646657.

It is not a weakly prime, because it can be changed into another prime (40646651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20323328 + 20323329.

It is an arithmetic number, because the mean of its divisors is an integer number (20323329).

Almost surely, 2^40646657 is an apocalyptic number.

It is an amenable number.

40646657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40646657 is an equidigital number, since it uses as much as digits as its factorization.

40646657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 40646657 is about 6375.4730804859. The cubic root of 40646657 is about 343.8282928222.

The spelling of 40646657 in words is "forty million, six hundred forty-six thousand, six hundred fifty-seven".