84686939 has 2 divisors, whose sum is σ = 84686940. Its totient is φ = 84686938.

The previous prime is 84686893. The next prime is 84686957. The reversal of 84686939 is 93968648.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84686939 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84686039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42343469 + 42343470.

It is an arithmetic number, because the mean of its divisors is an integer number (42343470).

Almost surely, 2^84686939 is an apocalyptic number.

84686939 is a deficient number, since it is larger than the sum of its proper divisors (1).

84686939 is an equidigital number, since it uses as much as digits as its factorization.

84686939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 53.

The square root of 84686939 is about 9202.5506790237. The cubic root of 84686939 is about 439.1425086879.

The spelling of 84686939 in words is "eighty-four million, six hundred eighty-six thousand, nine hundred thirty-nine".