18474779 has 2 divisors, whose sum is σ = 18474780. Its totient is φ = 18474778.

The previous prime is 18474763. The next prime is 18474787. The reversal of 18474779 is 97747481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18474779 - 2⁴ = 18474763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18474719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237389 + 9237390.

It is an arithmetic number, because the mean of its divisors is an integer number (9237390).

Almost surely, 2^18474779 is an apocalyptic number.

18474779 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474779 is an equidigital number, since it uses as much as digits as its factorization.

18474779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 18474779 is about 4298.2297518862. The cubic root of 18474779 is about 264.3583813119.

The spelling of 18474779 in words is "eighteen million, four hundred seventy-four thousand, seven hundred seventy-nine".