18138562 has 8 divisors (see below), whose sum is σ = 29300796. Its totient is φ = 8371632.

The previous prime is 18138551. The next prime is 18138563. The reversal of 18138562 is 26583181.

It can be written as a sum of positive squares in 2 ways, for example, as 17397241 + 741321 = 4171^2 + 861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18138563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348793 + ... + 348844.

Almost surely, 2^18138562 is an apocalyptic number.

18138562 is a deficient number, since it is larger than the sum of its proper divisors (11162234).

18138562 is a wasteful number, since it uses less digits than its factorization.

18138562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697652.

The product of its digits is 11520, while the sum is 34.

The square root of 18138562 is about 4258.9390697684. The cubic root of 18138562 is about 262.7448937584.

The spelling of 18138562 in words is "eighteen million, one hundred thirty-eight thousand, five hundred sixty-two".