858489979 has 2 divisors, whose sum is σ = 858489980. Its totient is φ = 858489978.

The previous prime is 858489971. The next prime is 858490033. The reversal of 858489979 is 979984858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 858489979 - 2³ = 858489971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (858489971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429244989 + 429244990.

It is an arithmetic number, because the mean of its divisors is an integer number (429244990).

Almost surely, 2^858489979 is an apocalyptic number.

858489979 is a deficient number, since it is larger than the sum of its proper divisors (1).

858489979 is an equidigital number, since it uses as much as digits as its factorization.

858489979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 67.

The square root of 858489979 is about 29299.9996416382. Note that the first 3 decimals coincide. The cubic root of 858489979 is about 950.4116328796.

The spelling of 858489979 in words is "eight hundred fifty-eight million, four hundred eighty-nine thousand, nine hundred seventy-nine".