18180479 has 2 divisors, whose sum is σ = 18180480. Its totient is φ = 18180478.

The previous prime is 18180469. The next prime is 18180499. The reversal of 18180479 is 97408181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18180479 - 2⁸ = 18180223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18180439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090239 + 9090240.

It is an arithmetic number, because the mean of its divisors is an integer number (9090240).

Almost surely, 2^18180479 is an apocalyptic number.

18180479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180479 is an equidigital number, since it uses as much as digits as its factorization.

18180479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18180479 is about 4263.8572912329. The cubic root of 18180479 is about 262.9471333255.

The spelling of 18180479 in words is "eighteen million, one hundred eighty thousand, four hundred seventy-nine".