18009479 has 2 divisors, whose sum is σ = 18009480. Its totient is φ = 18009478.

The previous prime is 18009469. The next prime is 18009503. The reversal of 18009479 is 97490081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18009479 - 2⁴ = 18009463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18009469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004739 + 9004740.

It is an arithmetic number, because the mean of its divisors is an integer number (9004740).

Almost surely, 2^18009479 is an apocalyptic number.

18009479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18009479 is an equidigital number, since it uses as much as digits as its factorization.

18009479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 18009479 is about 4243.7576509504. The cubic root of 18009479 is about 262.1201350658.

The spelling of 18009479 in words is "eighteen million, nine thousand, four hundred seventy-nine".