39680657 has 2 divisors, whose sum is σ = 39680658. Its totient is φ = 39680656.

The previous prime is 39680653. The next prime is 39680677. The reversal of 39680657 is 75608693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 355216 = 6271^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 39680657 - 2² = 39680653 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39680653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19840328 + 19840329.

It is an arithmetic number, because the mean of its divisors is an integer number (19840329).

Almost surely, 2^39680657 is an apocalyptic number.

It is an amenable number.

39680657 is a deficient number, since it is larger than the sum of its proper divisors (1).

39680657 is an equidigital number, since it uses as much as digits as its factorization.

39680657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 39680657 is about 6299.2584484207. The cubic root of 39680657 is about 341.0826417978.

Subtracting 39680657 from its reverse (75608693), we obtain a square (35928036 = 5994²).

The spelling of 39680657 in words is "thirty-nine million, six hundred eighty thousand, six hundred fifty-seven".