18877222 has 64 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 6873984.

The previous prime is 18877189. The next prime is 18877223. The reversal of 18877222 is 22277881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18877223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183223 + ... + 183325.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^18877222 is an apocalyptic number.

18877222 is a deficient number, since it is larger than the sum of its proper divisors (18862298).

18877222 is a wasteful number, since it uses less digits than its factorization.

18877222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its digits is 25088, while the sum is 37.

The square root of 18877222 is about 4344.7925151841. The cubic root of 18877222 is about 266.2641486306.

The spelling of 18877222 in words is "eighteen million, eight hundred seventy-seven thousand, two hundred twenty-two".