18242638 has 16 divisors (see below), whose sum is σ = 27780480. Its totient is φ = 8983800.

The previous prime is 18242633. The next prime is 18242659. The reversal of 18242638 is 83624281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58503 + ... + 58813.

It is an arithmetic number, because the mean of its divisors is an integer number (1736280).

Almost surely, 2^18242638 is an apocalyptic number.

18242638 is a deficient number, since it is larger than the sum of its proper divisors (9537842).

18242638 is a wasteful number, since it uses less digits than its factorization.

18242638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

The product of its digits is 18432, while the sum is 34.

The square root of 18242638 is about 4271.1401288181. The cubic root of 18242638 is about 263.2464642519.

The spelling of 18242638 in words is "eighteen million, two hundred forty-two thousand, six hundred thirty-eight".