39986951 has 2 divisors, whose sum is σ = 39986952. Its totient is φ = 39986950.

The previous prime is 39986939. The next prime is 39986953. The reversal of 39986951 is 15968993.

It is a strong prime.

It is an emirp because it is prime and its reverse (15968993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39986951 is a prime.

Together with 39986953, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39986951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39986953) 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, 19993475 + 19993476.

It is an arithmetic number, because the mean of its divisors is an integer number (19993476).

Almost surely, 2^39986951 is an apocalyptic number.

39986951 is a deficient number, since it is larger than the sum of its proper divisors (1).

39986951 is an equidigital number, since it uses as much as digits as its factorization.

39986951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 39986951 is about 6323.5236221588. The cubic root of 39986951 is about 341.9579961637.

The spelling of 39986951 in words is "thirty-nine million, nine hundred eighty-six thousand, nine hundred fifty-one".