86442779 has 2 divisors, whose sum is σ = 86442780. Its totient is φ = 86442778.

The previous prime is 86442743. The next prime is 86442791. The reversal of 86442779 is 97724468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86442779 - 2²⁰ = 85394203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86442709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43221389 + 43221390.

It is an arithmetic number, because the mean of its divisors is an integer number (43221390).

Almost surely, 2^86442779 is an apocalyptic number.

86442779 is a deficient number, since it is larger than the sum of its proper divisors (1).

86442779 is an equidigital number, since it uses as much as digits as its factorization.

86442779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 86442779 is about 9297.4608899419. The cubic root of 86442779 is about 442.1567303832.

The spelling of 86442779 in words is "eighty-six million, four hundred forty-two thousand, seven hundred seventy-nine".