18764138 has 8 divisors (see below), whose sum is σ = 28222788. Its totient is φ = 9356544.

The previous prime is 18764117. The next prime is 18764167. The reversal of 18764138 is 83146781.

It can be written as a sum of positive squares in 2 ways, for example, as 18722929 + 41209 = 4327^2 + 203^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11831 + ... + 13322.

Almost surely, 2^18764138 is an apocalyptic number.

18764138 is a deficient number, since it is larger than the sum of its proper divisors (9458650).

18764138 is a wasteful number, since it uses less digits than its factorization.

18764138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25528.

The product of its digits is 32256, while the sum is 38.

The square root of 18764138 is about 4331.7592269192. The cubic root of 18764138 is about 265.7313982614.

The spelling of 18764138 in words is "eighteen million, seven hundred sixty-four thousand, one hundred thirty-eight".