39985871 has 2 divisors, whose sum is σ = 39985872. Its totient is φ = 39985870.

The previous prime is 39985849. The next prime is 39985951. The reversal of 39985871 is 17858993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39985871 - 2¹⁴ = 39969487 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 (39985471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19992935 + 19992936.

It is an arithmetic number, because the mean of its divisors is an integer number (19992936).

Almost surely, 2^39985871 is an apocalyptic number.

39985871 is a deficient number, since it is larger than the sum of its proper divisors (1).

39985871 is an equidigital number, since it uses as much as digits as its factorization.

39985871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 39985871 is about 6323.4382261551. The cubic root of 39985871 is about 341.9549175097.

The spelling of 39985871 in words is "thirty-nine million, nine hundred eighty-five thousand, eight hundred seventy-one".