39665497 has 2 divisors, whose sum is σ = 39665498. Its totient is φ = 39665496.

The previous prime is 39665489. The next prime is 39665519. The reversal of 39665497 is 79456693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36772096 + 2893401 = 6064^2 + 1701^2 .

It is an emirp because it is prime and its reverse (79456693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39665497 - 2³ = 39665489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39665497.

It is not a weakly prime, because it can be changed into another prime (39665477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19832748 + 19832749.

It is an arithmetic number, because the mean of its divisors is an integer number (19832749).

Almost surely, 2^39665497 is an apocalyptic number.

It is an amenable number.

39665497 is a deficient number, since it is larger than the sum of its proper divisors (1).

39665497 is an equidigital number, since it uses as much as digits as its factorization.

39665497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 49.

The square root of 39665497 is about 6298.0550172256. The cubic root of 39665497 is about 341.0391993762.

The spelling of 39665497 in words is "thirty-nine million, six hundred sixty-five thousand, four hundred ninety-seven".