40265681 has 2 divisors, whose sum is σ = 40265682. Its totient is φ = 40265680.

The previous prime is 40265677. The next prime is 40265689. The reversal of 40265681 is 18656204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 512656 = 6305^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 40265681 - 2² = 40265677 is a prime.

It is a super-2 number, since 2×40265681² = 3242650132787522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40265689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20132840 + 20132841.

It is an arithmetic number, because the mean of its divisors is an integer number (20132841).

Almost surely, 2^40265681 is an apocalyptic number.

It is an amenable number.

40265681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40265681 is an equidigital number, since it uses as much as digits as its factorization.

40265681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 40265681 is about 6345.5244858089. The cubic root of 40265681 is about 342.7506992899.

The spelling of 40265681 in words is "forty million, two hundred sixty-five thousand, six hundred eighty-one".