40612721 has 2 divisors, whose sum is σ = 40612722. Its totient is φ = 40612720.

The previous prime is 40612679. The next prime is 40612727. The reversal of 40612721 is 12721604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40500496 + 112225 = 6364^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 40612721 - 2⁶ = 40612657 is a prime.

It is not a weakly prime, because it can be changed into another prime (40612727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20306360 + 20306361.

It is an arithmetic number, because the mean of its divisors is an integer number (20306361).

Almost surely, 2^40612721 is an apocalyptic number.

It is an amenable number.

40612721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40612721 is an equidigital number, since it uses as much as digits as its factorization.

40612721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 40612721 is about 6372.8110751850. The cubic root of 40612721 is about 343.7325784669.

The spelling of 40612721 in words is "forty million, six hundred twelve thousand, seven hundred twenty-one".