39680393 has 2 divisors, whose sum is σ = 39680394. Its totient is φ = 39680392.

The previous prime is 39680351. The next prime is 39680413. The reversal of 39680393 is 39308693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39476089 + 204304 = 6283^2 + 452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39680393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39680393.

It is not a weakly prime, because it can be changed into another prime (39686393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19840196 + 19840197.

It is an arithmetic number, because the mean of its divisors is an integer number (19840197).

Almost surely, 2^39680393 is an apocalyptic number.

It is an amenable number.

39680393 is a deficient number, since it is larger than the sum of its proper divisors (1).

39680393 is an equidigital number, since it uses as much as digits as its factorization.

39680393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 39680393 is about 6299.2374935384. The cubic root of 39680393 is about 341.0818853754.

The spelling of 39680393 in words is "thirty-nine million, six hundred eighty thousand, three hundred ninety-three".