18245138 has 4 divisors (see below), whose sum is σ = 27367710. Its totient is φ = 9122568.

The previous prime is 18245137. The next prime is 18245153. The reversal of 18245138 is 83154281.

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

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 2380849 = 3983^2 + 1543^2 .

It is not an unprimeable number, because it can be changed into a prime (18245137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4561283 + ... + 4561286.

Almost surely, 2^18245138 is an apocalyptic number.

18245138 is a deficient number, since it is larger than the sum of its proper divisors (9122572).

18245138 is an equidigital number, since it uses as much as digits as its factorization.

18245138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9122571.

The product of its digits is 7680, while the sum is 32.

The square root of 18245138 is about 4271.4327806955. The cubic root of 18245138 is about 263.2584889401.

The spelling of 18245138 in words is "eighteen million, two hundred forty-five thousand, one hundred thirty-eight".