18220190 has 8 divisors (see below), whose sum is σ = 32796360. Its totient is φ = 7288072.

The previous prime is 18220171. The next prime is 18220193. The reversal of 18220190 is 9102281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18220190² = 663950647272200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911000 + ... + 911019.

It is an arithmetic number, because the mean of its divisors is an integer number (4099545).

Almost surely, 2^18220190 is an apocalyptic number.

18220190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18220190 is a deficient number, since it is larger than the sum of its proper divisors (14576170).

18220190 is a wasteful number, since it uses less digits than its factorization.

18220190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822026.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18220190 is about 4268.5114501428. The cubic root of 18220190 is about 263.1384429201.

The spelling of 18220190 in words is "eighteen million, two hundred twenty thousand, one hundred ninety".