18227420 has 12 divisors (see below), whose sum is σ = 38277624. Its totient is φ = 7290960.

The previous prime is 18227371. The next prime is 18227437. The reversal of 18227420 is 2472281.

It is a self number, because there is not a number n which added to its sum of digits gives 18227420.

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, 455666 + ... + 455705.

It is an arithmetic number, because the mean of its divisors is an integer number (3189802).

Almost surely, 2^18227420 is an apocalyptic number.

18227420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18227420 is an abundant number, since it is smaller than the sum of its proper divisors (20050204).

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

18227420 is a wasteful number, since it uses less digits than its factorization.

18227420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911380 (or 911378 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 18227420 is about 4269.3582655945. The cubic root of 18227420 is about 263.1732438626.

The spelling of 18227420 in words is "eighteen million, two hundred twenty-seven thousand, four hundred twenty".