18311230 has 32 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 6252576.

The previous prime is 18311221. The next prime is 18311239. The reversal of 18311230 is 3211381.

It is an interprime number because it is at equal distance from previous prime (18311221) and next prime (18311239).

It is a super-2 number, since 2×18311230² = 670602288225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18311198 and 18311207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311239) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 26469 + ... + 27151.

It is an arithmetic number, because the mean of its divisors is an integer number (1181952).

Almost surely, 2^18311230 is an apocalyptic number.

18311230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18311230 is an abundant number, since it is smaller than the sum of its proper divisors (19511234).

18311230 is a wasteful number, since it uses less digits than its factorization.

18311230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18311230 is about 4279.1623011987. The cubic root of 18311230 is about 263.5759856328.

The spelling of 18311230 in words is "eighteen million, three hundred eleven thousand, two hundred thirty".