40564921 has 2 divisors, whose sum is σ = 40564922. Its totient is φ = 40564920.

The previous prime is 40564903. The next prime is 40564963. The reversal of 40564921 is 12946504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 622521 = 6320^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 40564921 - 2⁵ = 40564889 is a prime.

It is not a weakly prime, because it can be changed into another prime (40564991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20282460 + 20282461.

It is an arithmetic number, because the mean of its divisors is an integer number (20282461).

Almost surely, 2^40564921 is an apocalyptic number.

It is an amenable number.

40564921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40564921 is an equidigital number, since it uses as much as digits as its factorization.

40564921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 40564921 is about 6369.0596637180. The cubic root of 40564921 is about 343.5976710857.

The spelling of 40564921 in words is "forty million, five hundred sixty-four thousand, nine hundred twenty-one".