18147330 has 96 divisors (see below), whose sum is σ = 51807600. Its totient is φ = 4386816.

The previous prime is 18147329. The next prime is 18147343. The reversal of 18147330 is 3374181.

It can be written as a sum of positive squares in 8 ways, for example, as 14676561 + 3470769 = 3831^2 + 1863^2 .

It is a super-2 number, since 2×18147330² = 658651172257800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18147294 and 18147303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44166 + ... + 44574.

Almost surely, 2^18147330 is an apocalyptic number.

18147330 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 18147330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25903800).

18147330 is an abundant number, since it is smaller than the sum of its proper divisors (33660270).

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

18147330 is a wasteful number, since it uses less digits than its factorization.

18147330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18147330 is about 4259.9683097413. The cubic root of 18147330 is about 262.7872230258.

It can be divided in two parts, 181473 and 30, that added together give a triangular number (181503 = T₆₀₂).

The spelling of 18147330 in words is "eighteen million, one hundred forty-seven thousand, three hundred thirty".