18812222 has 16 divisors (see below), whose sum is σ = 33152112. Its totient is φ = 7893120.

The previous prime is 18812221. The next prime is 18812237. The reversal of 18812222 is 22221881.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 18812191 and 18812200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18812221) 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, 32603 + ... + 33174.

It is an arithmetic number, because the mean of its divisors is an integer number (2072007).

Almost surely, 2^18812222 is an apocalyptic number.

18812222 is a deficient number, since it is larger than the sum of its proper divisors (14339890).

18812222 is a wasteful number, since it uses less digits than its factorization.

18812222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65803.

The product of its digits is 1024, while the sum is 26.

The square root of 18812222 is about 4337.3058457987. The cubic root of 18812222 is about 265.9581877860.

The spelling of 18812222 in words is "eighteen million, eight hundred twelve thousand, two hundred twenty-two".