39868657 has 2 divisors, whose sum is σ = 39868658. Its totient is φ = 39868656.

The previous prime is 39868613. The next prime is 39868679. The reversal of 39868657 is 75686893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29116816 + 10751841 = 5396^2 + 3279^2 .

It is a cyclic number.

It is not a de Polignac number, because 39868657 - 2¹¹ = 39866609 is a prime.

It is not a weakly prime, because it can be changed into another prime (39868357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19934328 + 19934329.

It is an arithmetic number, because the mean of its divisors is an integer number (19934329).

Almost surely, 2^39868657 is an apocalyptic number.

It is an amenable number.

39868657 is a deficient number, since it is larger than the sum of its proper divisors (1).

39868657 is an equidigital number, since it uses as much as digits as its factorization.

39868657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 39868657 is about 6314.1632066332. The cubic root of 39868657 is about 341.6204565966.

The spelling of 39868657 in words is "thirty-nine million, eight hundred sixty-eight thousand, six hundred fifty-seven".