40685497 has 2 divisors, whose sum is σ = 40685498. Its totient is φ = 40685496.

The previous prime is 40685473. The next prime is 40685509. The reversal of 40685497 is 79458604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39388176 + 1297321 = 6276^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40685497 is a prime.

It is a super-2 number, since 2×40685497² = 3310619332274018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40685467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342748 + 20342749.

It is an arithmetic number, because the mean of its divisors is an integer number (20342749).

Almost surely, 2^40685497 is an apocalyptic number.

It is an amenable number.

40685497 is a deficient number, since it is larger than the sum of its proper divisors (1).

40685497 is an equidigital number, since it uses as much as digits as its factorization.

40685497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 40685497 is about 6378.5184016353. The cubic root of 40685497 is about 343.9377732450.

The spelling of 40685497 in words is "forty million, six hundred eighty-five thousand, four hundred ninety-seven".