18087479 has 2 divisors, whose sum is σ = 18087480. Its totient is φ = 18087478.

The previous prime is 18087457. The next prime is 18087481. The reversal of 18087479 is 97478081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18087479 is a prime.

It is a Sophie Germain prime.

Together with 18087481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18087079) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043739 + 9043740.

It is an arithmetic number, because the mean of its divisors is an integer number (9043740).

Almost surely, 2^18087479 is an apocalyptic number.

18087479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087479 is an equidigital number, since it uses as much as digits as its factorization.

18087479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 18087479 is about 4252.9376905852. The cubic root of 18087479 is about 262.4980087528.

The spelling of 18087479 in words is "eighteen million, eighty-seven thousand, four hundred seventy-nine".