39917893 has 2 divisors, whose sum is σ = 39917894. Its totient is φ = 39917892.

The previous prime is 39917869. The next prime is 39917897. The reversal of 39917893 is 39871993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37540129 + 2377764 = 6127^2 + 1542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39917893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39917897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19958946 + 19958947.

It is an arithmetic number, because the mean of its divisors is an integer number (19958947).

Almost surely, 2^39917893 is an apocalyptic number.

It is an amenable number.

39917893 is a deficient number, since it is larger than the sum of its proper divisors (1).

39917893 is an equidigital number, since it uses as much as digits as its factorization.

39917893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 39917893 is about 6318.0608575733. The cubic root of 39917893 is about 341.7610273843.

The spelling of 39917893 in words is "thirty-nine million, nine hundred seventeen thousand, eight hundred ninety-three".