39966917 has 2 divisors, whose sum is σ = 39966918. Its totient is φ = 39966916.

The previous prime is 39966889. The next prime is 39966931. The reversal of 39966917 is 71966993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37039396 + 2927521 = 6086^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 39966917 - 2⁶ = 39966853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39966947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19983458 + 19983459.

It is an arithmetic number, because the mean of its divisors is an integer number (19983459).

Almost surely, 2^39966917 is an apocalyptic number.

It is an amenable number.

39966917 is a deficient number, since it is larger than the sum of its proper divisors (1).

39966917 is an equidigital number, since it uses as much as digits as its factorization.

39966917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 50.

The square root of 39966917 is about 6321.9393385258. The cubic root of 39966917 is about 341.9008781060.

The spelling of 39966917 in words is "thirty-nine million, nine hundred sixty-six thousand, nine hundred seventeen".