18420226 has 8 divisors (see below), whose sum is σ = 30142224. Its totient is φ = 8372820.

The previous prime is 18420221. The next prime is 18420229. The reversal of 18420226 is 62202481.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18420226.

It is not an unprimeable number, because it can be changed into a prime (18420221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418620 + ... + 418663.

It is an arithmetic number, because the mean of its divisors is an integer number (3767778).

Almost surely, 2^18420226 is an apocalyptic number.

18420226 is a deficient number, since it is larger than the sum of its proper divisors (11721998).

18420226 is a wasteful number, since it uses less digits than its factorization.

18420226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837296.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 18420226 is about 4291.8790756497. The cubic root of 18420226 is about 264.0979224285.

The spelling of 18420226 in words is "eighteen million, four hundred twenty thousand, two hundred twenty-six".