18780222 has 8 divisors (see below), whose sum is σ = 37560456. Its totient is φ = 6260072.

The previous prime is 18780221. The next prime is 18780233. The reversal of 18780222 is 22208781.

It is a happy number.

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

18780222 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18780222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780221) 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, 1565013 + ... + 1565024.

It is an arithmetic number, because the mean of its divisors is an integer number (4695057).

Almost surely, 2^18780222 is an apocalyptic number.

18780222 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.

18780222 is a wasteful number, since it uses less digits than its factorization.

18780222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130042.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18780222 is about 4333.6153497974. The cubic root of 18780222 is about 265.8073019739.

The spelling of 18780222 in words is "eighteen million, seven hundred eighty thousand, two hundred twenty-two".