18238016 has 14 divisors (see below), whose sum is σ = 36191190. Its totient is φ = 9118976.

The previous prime is 18238009. The next prime is 18238039. The reversal of 18238016 is 61083281.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 2238016 = 4000^2 + 1496^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18238016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142421 + ... + 142548.

It is an arithmetic number, because the mean of its divisors is an integer number (2585085).

Almost surely, 2^18238016 is an apocalyptic number.

18238016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18238016 is a deficient number, since it is larger than the sum of its proper divisors (17953174).

18238016 is an equidigital number, since it uses as much as digits as its factorization.

18238016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284981 (or 284971 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18238016 is about 4270.5990212147. The cubic root of 18238016 is about 263.2242301150.

The spelling of 18238016 in words is "eighteen million, two hundred thirty-eight thousand, sixteen".