18242558 has 4 divisors (see below), whose sum is σ = 27363840. Its totient is φ = 9121278.

The previous prime is 18242557. The next prime is 18242561. The reversal of 18242558 is 85524281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4560638 + ... + 4560641.

It is an arithmetic number, because the mean of its divisors is an integer number (6840960).

Almost surely, 2^18242558 is an apocalyptic number.

18242558 is a deficient number, since it is larger than the sum of its proper divisors (9121282).

18242558 is an equidigital number, since it uses as much as digits as its factorization.

18242558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9121281.

The product of its digits is 25600, while the sum is 35.

The square root of 18242558 is about 4271.1307636269. The cubic root of 18242558 is about 263.2460794437.

The spelling of 18242558 in words is "eighteen million, two hundred forty-two thousand, five hundred fifty-eight".