18243930 has 16 divisors (see below), whose sum is σ = 43785504. Its totient is φ = 4865040.

The previous prime is 18243917. The next prime is 18243949. The reversal of 18243930 is 3934281.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 608131 = 18243930 / (1 + 8 + 2 + 4 + 3 + 9 + 3 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304036 + ... + 304095.

It is an arithmetic number, because the mean of its divisors is an integer number (2736594).

Almost surely, 2^18243930 is an apocalyptic number.

18243930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18243930 is an abundant number, since it is smaller than the sum of its proper divisors (25541574).

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

18243930 is a wasteful number, since it uses less digits than its factorization.

18243930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608141.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 18243930 is about 4271.2913738119. The cubic root of 18243930 is about 263.2526787479.

The spelling of 18243930 in words is "eighteen million, two hundred forty-three thousand, nine hundred thirty".