18500222 has 16 divisors (see below), whose sum is σ = 30694272. Its totient is φ = 8307360.

The previous prime is 18500221. The next prime is 18500227. The reversal of 18500222 is 22200581.

It is a junction number, because it is equal to n+sod(n) for n = 18500194 and 18500203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8654 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (1918392).

Almost surely, 2^18500222 is an apocalyptic number.

18500222 is a deficient number, since it is larger than the sum of its proper divisors (12194050).

18500222 is a wasteful number, since it uses less digits than its factorization.

18500222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19283.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 18500222 is about 4301.1884404197. The cubic root of 18500222 is about 264.4796815450.

The spelling of 18500222 in words is "eighteen million, five hundred thousand, two hundred twenty-two".