39995887 has 2 divisors, whose sum is σ = 39995888. Its totient is φ = 39995886.

The previous prime is 39995881. The next prime is 39995903. The reversal of 39995887 is 78859993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39995887 - 2¹⁹ = 39471599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39995881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19997943 + 19997944.

It is an arithmetic number, because the mean of its divisors is an integer number (19997944).

Almost surely, 2^39995887 is an apocalyptic number.

39995887 is a deficient number, since it is larger than the sum of its proper divisors (1).

39995887 is an equidigital number, since it uses as much as digits as its factorization.

39995887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 58.

The square root of 39995887 is about 6324.2301507772. The cubic root of 39995887 is about 341.9834670484.

The spelling of 39995887 in words is "thirty-nine million, nine hundred ninety-five thousand, eight hundred eighty-seven".