18015930 has 24 divisors (see below), whose sum is σ = 46841652. Its totient is φ = 4804224.

The previous prime is 18015917. The next prime is 18015941. The reversal of 18015930 is 3951081.

It can be written as a sum of positive squares in 2 ways, for example, as 16136289 + 1879641 = 4017^2 + 1371^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18015894 and 18015903.

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 11 ways as a sum of consecutive naturals, for example, 99999 + ... + 100178.

Almost surely, 2^18015930 is an apocalyptic number.

18015930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18015930 is an abundant number, since it is smaller than the sum of its proper divisors (28825722).

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

18015930 is a wasteful number, since it uses less digits than its factorization.

18015930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200190 (or 200187 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18015930 is about 4244.5176404393. The cubic root of 18015930 is about 262.1514284962.

It can be divided in two parts, 180 and 15930, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 18015930 in words is "eighteen million, fifteen thousand, nine hundred thirty".