39868613 has 2 divisors, whose sum is σ = 39868614. Its totient is φ = 39868612.

The previous prime is 39868597. The next prime is 39868657. The reversal of 39868613 is 31686893.

It is an a-pointer prime, because the next prime (39868657) can be obtained adding 39868613 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35796289 + 4072324 = 5983^2 + 2018^2 .

It is a cyclic number.

It is not a de Polignac number, because 39868613 - 2⁴ = 39868597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39868013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19934306 + 19934307.

It is an arithmetic number, because the mean of its divisors is an integer number (19934307).

Almost surely, 2^39868613 is an apocalyptic number.

It is an amenable number.

39868613 is a deficient number, since it is larger than the sum of its proper divisors (1).

39868613 is an equidigital number, since it uses as much as digits as its factorization.

39868613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 39868613 is about 6314.1597224017. The cubic root of 39868613 is about 341.6203309231.

The spelling of 39868613 in words is "thirty-nine million, eight hundred sixty-eight thousand, six hundred thirteen".