18000779 has 2 divisors, whose sum is σ = 18000780. Its totient is φ = 18000778.

The previous prime is 18000769. The next prime is 18000797. The reversal of 18000779 is 97700081.

Together with next prime (18000797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18000779 - 2¹² = 17996683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18000709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000389 + 9000390.

It is an arithmetic number, because the mean of its divisors is an integer number (9000390).

Almost surely, 2^18000779 is an apocalyptic number.

18000779 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000779 is an equidigital number, since it uses as much as digits as its factorization.

18000779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 18000779 is about 4242.7324921564. The cubic root of 18000779 is about 262.0779200285.

The spelling of 18000779 in words is "eighteen million, seven hundred seventy-nine", and thus it is an aban number.