18028930 has 16 divisors (see below), whose sum is σ = 33244344. Its totient is φ = 7035520.

The previous prime is 18028921. The next prime is 18028931. The reversal of 18028930 is 3982081.

It can be written as a sum of positive squares in 4 ways, for example, as 9566649 + 8462281 = 3093^2 + 2909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18028892 and 18028901.

It is not an unprimeable number, because it can be changed into a prime (18028931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21577 + ... + 22396.

Almost surely, 2^18028930 is an apocalyptic number.

18028930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18028930 is a deficient number, since it is larger than the sum of its proper divisors (15215414).

18028930 is a wasteful number, since it uses less digits than its factorization.

18028930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44021.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18028930 is about 4246.0487514865. The cubic root of 18028930 is about 262.2144680615.

The spelling of 18028930 in words is "eighteen million, twenty-eight thousand, nine hundred thirty".