39218939 has 2 divisors, whose sum is σ = 39218940. Its totient is φ = 39218938.

The previous prime is 39218903. The next prime is 39218969. The reversal of 39218939 is 93981293.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39218939 - 2²⁴ = 22441723 is a prime.

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 39218939.

It is not a weakly prime, because it can be changed into another prime (39218969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19609469 + 19609470.

It is an arithmetic number, because the mean of its divisors is an integer number (19609470).

Almost surely, 2^39218939 is an apocalyptic number.

39218939 is a deficient number, since it is larger than the sum of its proper divisors (1).

39218939 is an equidigital number, since it uses as much as digits as its factorization.

39218939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 39218939 is about 6262.5026147699. The cubic root of 39218939 is about 339.7545489147.

The spelling of 39218939 in words is "thirty-nine million, two hundred eighteen thousand, nine hundred thirty-nine".