18212190 has 32 divisors (see below), whose sum is σ = 45121536. Its totient is φ = 4699680.

The previous prime is 18212189. The next prime is 18212191. The reversal of 18212190 is 9121281.

It is an interprime number because it is at equal distance from previous prime (18212189) and next prime (18212191).

It is a super-2 number, since 2×18212190² = 663367729192200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18212190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212191) 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, 8862 + ... + 10721.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^18212190 is an apocalyptic number.

18212190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18212190 is an abundant number, since it is smaller than the sum of its proper divisors (26909346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18212190 is a wasteful number, since it uses less digits than its factorization.

18212190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19624.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 18212190 is about 4267.5742524296. The cubic root of 18212190 is about 263.0999249223.

Subtracting from 18212190 its reverse (9121281), we obtain a palindrome (9090909).

The spelling of 18212190 in words is "eighteen million, two hundred twelve thousand, one hundred ninety".