40315657 has 2 divisors, whose sum is σ = 40315658. Its totient is φ = 40315656.

The previous prime is 40315631. The next prime is 40315661. The reversal of 40315657 is 75651304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 423801 = 6316^2 + 651^2 .

It is a cyclic number.

It is not a de Polignac number, because 40315657 - 2⁷ = 40315529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40310657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20157828 + 20157829.

It is an arithmetic number, because the mean of its divisors is an integer number (20157829).

Almost surely, 2^40315657 is an apocalyptic number.

It is an amenable number.

40315657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40315657 is an equidigital number, since it uses as much as digits as its factorization.

40315657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 40315657 is about 6349.4611582401. The cubic root of 40315657 is about 342.8924430503.

The spelling of 40315657 in words is "forty million, three hundred fifteen thousand, six hundred fifty-seven".