18642330 has 96 divisors (see below), whose sum is σ = 56070144. Its totient is φ = 4209408.

The previous prime is 18642329. The next prime is 18642343. The reversal of 18642330 is 3324681.

It is a happy number.

18642330 is a `hidden beast` number, since 18 + 642 + 3 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18642294 and 18642303.

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 47 ways as a sum of consecutive naturals, for example, 79894 + ... + 80126.

It is an arithmetic number, because the mean of its divisors is an integer number (584064).

Almost surely, 2^18642330 is an apocalyptic number.

18642330 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 18642330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28035072).

18642330 is an abundant number, since it is smaller than the sum of its proper divisors (37427814).

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

18642330 is a wasteful number, since it uses less digits than its factorization.

18642330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 18642330 is about 4317.6764584670. The cubic root of 18642330 is about 265.1551482608.

The spelling of 18642330 in words is "eighteen million, six hundred forty-two thousand, three hundred thirty".