18380418 has 16 divisors (see below), whose sum is σ = 42012480. Its totient is φ = 5251536.

The previous prime is 18380413. The next prime is 18380419. The reversal of 18380418 is 81408381.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18380413) 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, 218773 + ... + 218856.

It is an arithmetic number, because the mean of its divisors is an integer number (2625780).

Almost surely, 2^18380418 is an apocalyptic number.

18380418 is an abundant number, since it is smaller than the sum of its proper divisors (23632062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18380418 is a wasteful number, since it uses less digits than its factorization.

18380418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437641.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 18380418 is about 4287.2389716460. The cubic root of 18380418 is about 263.9075376385.

Adding to 18380418 its reverse (81408381), we get a palindrome (99788799).

It can be divided in two parts, 183 and 80418, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 18380418 in words is "eighteen million, three hundred eighty thousand, four hundred eighteen".