18136230 has 64 divisors (see below), whose sum is σ = 50526720. Its totient is φ = 4080384.

The previous prime is 18136211. The next prime is 18136243. The reversal of 18136230 is 3263181.

It is a super-2 number, since 2×18136230² = 657845677225800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18136230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13426 + ... + 14714.

It is an arithmetic number, because the mean of its divisors is an integer number (789480).

Almost surely, 2^18136230 is an apocalyptic number.

18136230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18136230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25263360).

18136230 is an abundant number, since it is smaller than the sum of its proper divisors (32390490).

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

18136230 is a wasteful number, since it uses less digits than its factorization.

18136230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18136230 is about 4258.6652838654. The cubic root of 18136230 is about 262.7336332672.

The spelling of 18136230 in words is "eighteen million, one hundred thirty-six thousand, two hundred thirty".