18227730 has 32 divisors (see below), whose sum is σ = 45650304. Its totient is φ = 4649216.

The previous prime is 18227711. The next prime is 18227761. The reversal of 18227730 is 3772281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12519 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (1426572).

Almost surely, 2^18227730 is an apocalyptic number.

18227730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18227730 is an abundant number, since it is smaller than the sum of its proper divisors (27422574).

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

18227730 is a wasteful number, since it uses less digits than its factorization.

18227730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26450.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 18227730 is about 4269.3945706622. The cubic root of 18227730 is about 263.1747358134.

The spelling of 18227730 in words is "eighteen million, two hundred twenty-seven thousand, seven hundred thirty".