85978379 has 2 divisors, whose sum is σ = 85978380. Its totient is φ = 85978378.

The previous prime is 85978357. The next prime is 85978391. The reversal of 85978379 is 97387958.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85978379 is a prime.

It is not a weakly prime, because it can be changed into another prime (85978309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42989189 + 42989190.

It is an arithmetic number, because the mean of its divisors is an integer number (42989190).

Almost surely, 2^85978379 is an apocalyptic number.

85978379 is a deficient number, since it is larger than the sum of its proper divisors (1).

85978379 is an equidigital number, since it uses as much as digits as its factorization.

85978379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 85978379 is about 9272.4526960239. The cubic root of 85978379 is about 441.3635027558.

The spelling of 85978379 in words is "eighty-five million, nine hundred seventy-eight thousand, three hundred seventy-nine".