18019930 has 16 divisors (see below), whose sum is σ = 32620320. Its totient is φ = 7166992.

The previous prime is 18019927. The next prime is 18019931. The reversal of 18019930 is 3991081.

It is a junction number, because it is equal to n+sod(n) for n = 18019892 and 18019901.

It is not an unprimeable number, because it can be changed into a prime (18019931) 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 7 ways as a sum of consecutive naturals, for example, 3244 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (2038770).

Almost surely, 2^18019930 is an apocalyptic number.

18019930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18019930 is a deficient number, since it is larger than the sum of its proper divisors (14600390).

18019930 is a wasteful number, since it uses less digits than its factorization.

18019930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10253.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 18019930 is about 4244.9888103504. The cubic root of 18019930 is about 262.1708285146.

The spelling of 18019930 in words is "eighteen million, nineteen thousand, nine hundred thirty".