67921859 has 2 divisors, whose sum is σ = 67921860. Its totient is φ = 67921858.

The previous prime is 67921849. The next prime is 67921873. The reversal of 67921859 is 95812976.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67921859 - 2²⁰ = 66873283 is a prime.

It is a super-2 number, since 2×67921859² = 9226757860031762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67921849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33960929 + 33960930.

It is an arithmetic number, because the mean of its divisors is an integer number (33960930).

Almost surely, 2^67921859 is an apocalyptic number.

67921859 is a deficient number, since it is larger than the sum of its proper divisors (1).

67921859 is an equidigital number, since it uses as much as digits as its factorization.

67921859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 67921859 is about 8241.4718952381. The cubic root of 67921859 is about 408.0091048686.

The spelling of 67921859 in words is "sixty-seven million, nine hundred twenty-one thousand, eight hundred fifty-nine".