39986939 has 2 divisors, whose sum is σ = 39986940. Its totient is φ = 39986938.

The previous prime is 39986929. The next prime is 39986951. The reversal of 39986939 is 93968993.

It is a weak prime.

It is an emirp because it is prime and its reverse (93968993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39986939 - 2⁴ = 39986923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39986929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993469 + 19993470.

It is an arithmetic number, because the mean of its divisors is an integer number (19993470).

Almost surely, 2^39986939 is an apocalyptic number.

39986939 is a deficient number, since it is larger than the sum of its proper divisors (1).

39986939 is an equidigital number, since it uses as much as digits as its factorization.

39986939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 56.

The square root of 39986939 is about 6323.5226733206. The cubic root of 39986939 is about 341.9579619568.

The spelling of 39986939 in words is "thirty-nine million, nine hundred eighty-six thousand, nine hundred thirty-nine".