18034778 has 4 divisors (see below), whose sum is σ = 27052170. Its totient is φ = 9017388.

The previous prime is 18034771. The next prime is 18034789. The reversal of 18034778 is 87743081.

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., 17497489 + 537289 = 4183^2 + 733^2 .

It is not an unprimeable number, because it can be changed into a prime (18034771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4508693 + ... + 4508696.

Almost surely, 2^18034778 is an apocalyptic number.

18034778 is a deficient number, since it is larger than the sum of its proper divisors (9017392).

18034778 is an equidigital number, since it uses as much as digits as its factorization.

18034778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9017391.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 18034778 is about 4246.7373358850. The cubic root of 18034778 is about 262.2428162856.

The spelling of 18034778 in words is "eighteen million, thirty-four thousand, seven hundred seventy-eight".