18230645 has 4 divisors (see below), whose sum is σ = 21876780. Its totient is φ = 14584512.

The previous prime is 18230623. The next prime is 18230657. The reversal of 18230645 is 54603281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54603281 = 1223 ⋅44647.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 7739524 = 3239^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 18230645 - 2⁸ = 18230389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1823060 + ... + 1823069.

It is an arithmetic number, because the mean of its divisors is an integer number (5469195).

Almost surely, 2^18230645 is an apocalyptic number.

It is an amenable number.

18230645 is a deficient number, since it is larger than the sum of its proper divisors (3646135).

18230645 is an equidigital number, since it uses as much as digits as its factorization.

18230645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646134.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 18230645 is about 4269.7359403129. The cubic root of 18230645 is about 263.1887641367.

The spelling of 18230645 in words is "eighteen million, two hundred thirty thousand, six hundred forty-five".