18228873 has 16 divisors (see below), whose sum is σ = 26671680. Its totient is φ = 11004864.

The previous prime is 18228863. The next prime is 18228893. The reversal of 18228873 is 37882281.

It is not a de Polignac number, because 18228873 - 2¹⁰ = 18227849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18228863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2343 + ... + 6476.

It is an arithmetic number, because the mean of its divisors is an integer number (1666980).

Almost surely, 2^18228873 is an apocalyptic number.

18228873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18228873 is a deficient number, since it is larger than the sum of its proper divisors (8442807).

18228873 is a wasteful number, since it uses less digits than its factorization.

18228873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8888.

The product of its digits is 43008, while the sum is 39.

The square root of 18228873 is about 4269.5284282928. The cubic root of 18228873 is about 263.1802366344.

The spelling of 18228873 in words is "eighteen million, two hundred twenty-eight thousand, eight hundred seventy-three".