18238065 has 16 divisors (see below), whose sum is σ = 29269248. Its totient is φ = 9697536.

The previous prime is 18238039. The next prime is 18238067. The reversal of 18238065 is 56083281.

It is a happy number.

It is not a de Polignac number, because 18238065 - 2⁶ = 18238001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18238067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3849 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (1829328).

Almost surely, 2^18238065 is an apocalyptic number.

18238065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18238065 is a deficient number, since it is larger than the sum of its proper divisors (11031183).

18238065 is a wasteful number, since it uses less digits than its factorization.

18238065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18238065 is about 4270.6047581110. The cubic root of 18238065 is about 263.2244658493.

The spelling of 18238065 in words is "eighteen million, two hundred thirty-eight thousand, sixty-five".