86921839 has 2 divisors, whose sum is σ = 86921840. Its totient is φ = 86921838.

The previous prime is 86921801. The next prime is 86921851. The reversal of 86921839 is 93812968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86921839 - 2⁹ = 86921327 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 (86921539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43460919 + 43460920.

It is an arithmetic number, because the mean of its divisors is an integer number (43460920).

Almost surely, 2^86921839 is an apocalyptic number.

86921839 is a deficient number, since it is larger than the sum of its proper divisors (1).

86921839 is an equidigital number, since it uses as much as digits as its factorization.

86921839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 86921839 is about 9323.1882422270. The cubic root of 86921839 is about 442.9720269659.

The spelling of 86921839 in words is "eighty-six million, nine hundred twenty-one thousand, eight hundred thirty-nine".