40935721 has 2 divisors, whose sum is σ = 40935722. Its totient is φ = 40935720.

The previous prime is 40935707. The next prime is 40935743. The reversal of 40935721 is 12753904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22992025 + 17943696 = 4795^2 + 4236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40935721 is a prime.

It is not a weakly prime, because it can be changed into another prime (40935751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20467860 + 20467861.

It is an arithmetic number, because the mean of its divisors is an integer number (20467861).

Almost surely, 2^40935721 is an apocalyptic number.

It is an amenable number.

40935721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40935721 is an equidigital number, since it uses as much as digits as its factorization.

40935721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 40935721 is about 6398.1029219605. The cubic root of 40935721 is about 344.6414281937.

The spelling of 40935721 in words is "forty million, nine hundred thirty-five thousand, seven hundred twenty-one".