18218332 has 12 divisors (see below), whose sum is σ = 34780536. Its totient is φ = 8281040.

The previous prime is 18218329. The next prime is 18218357. The reversal of 18218332 is 23381281.

It is a self number, because there is not a number n which added to its sum of digits gives 18218332.

It is a congruent 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, 206983 + ... + 207070.

It is an arithmetic number, because the mean of its divisors is an integer number (2898378).

Almost surely, 2^18218332 is an apocalyptic number.

It is an amenable number.

18218332 is a deficient number, since it is larger than the sum of its proper divisors (16562204).

18218332 is a wasteful number, since it uses less digits than its factorization.

18218332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414068 (or 414066 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 18218332 is about 4268.2938043204. The cubic root of 18218332 is about 263.1294981205.

It can be divided in two parts, 1821 and 8332, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 18218332 in words is "eighteen million, two hundred eighteen thousand, three hundred thirty-two".