18418759 has 2 divisors, whose sum is σ = 18418760. Its totient is φ = 18418758.

The previous prime is 18418739. The next prime is 18418787. The reversal of 18418759 is 95781481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18418759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18418709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209379 + 9209380.

It is an arithmetic number, because the mean of its divisors is an integer number (9209380).

Almost surely, 2^18418759 is an apocalyptic number.

18418759 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418759 is an equidigital number, since it uses as much as digits as its factorization.

18418759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 18418759 is about 4291.7081680841. The cubic root of 18418759 is about 264.0909112598.

The spelling of 18418759 in words is "eighteen million, four hundred eighteen thousand, seven hundred fifty-nine".