18518422 has 16 divisors (see below), whose sum is σ = 30148272. Its totient is φ = 8480160.

The previous prime is 18518417. The next prime is 18518431. The reversal of 18518422 is 22481581.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (1884267).

Almost surely, 2^18518422 is an apocalyptic number.

18518422 is a deficient number, since it is larger than the sum of its proper divisors (11629850).

18518422 is a wasteful number, since it uses less digits than its factorization.

18518422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583.

The product of its digits is 5120, while the sum is 31.

The square root of 18518422 is about 4303.3036146663. The cubic root of 18518422 is about 264.5663823531.

The spelling of 18518422 in words is "eighteen million, five hundred eighteen thousand, four hundred twenty-two".