18218373 has 16 divisors (see below), whose sum is σ = 25857216. Its totient is φ = 11370240.

The previous prime is 18218371. The next prime is 18218381. The reversal of 18218373 is 37381281.

It is not a de Polignac number, because 18218373 - 2¹ = 18218371 is a prime.

It is a super-2 number, since 2×18218373² = 663818229534258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9915 + ... + 11607.

It is an arithmetic number, because the mean of its divisors is an integer number (1616076).

Almost surely, 2^18218373 is an apocalyptic number.

It is an amenable number.

18218373 is a deficient number, since it is larger than the sum of its proper divisors (7638843).

18218373 is a wasteful number, since it uses less digits than its factorization.

18218373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924.

The product of its digits is 8064, while the sum is 33.

The square root of 18218373 is about 4268.2986071736. The cubic root of 18218373 is about 263.1296955096.

The spelling of 18218373 in words is "eighteen million, two hundred eighteen thousand, three hundred seventy-three".