18951222 has 8 divisors (see below), whose sum is σ = 37902456. Its totient is φ = 6317072.

The previous prime is 18951217. The next prime is 18951269. The reversal of 18951222 is 22215981.

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

18951222 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18951222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1579263 + ... + 1579274.

It is an arithmetic number, because the mean of its divisors is an integer number (4737807).

Almost surely, 2^18951222 is an apocalyptic number.

18951222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18951222 is a wasteful number, since it uses less digits than its factorization.

18951222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158542.

The product of its digits is 2880, while the sum is 30.

The square root of 18951222 is about 4353.3001274895. The cubic root of 18951222 is about 266.6116195404.

The spelling of 18951222 in words is "eighteen million, nine hundred fifty-one thousand, two hundred twenty-two".