18243130 has 16 divisors (see below), whose sum is σ = 33458184. Its totient is φ = 7159360.

The previous prime is 18243103. The next prime is 18243133. The reversal of 18243130 is 3134281.

It can be written as a sum of positive squares in 4 ways, for example, as 18224361 + 18769 = 4269^2 + 137^2 .

It is not an unprimeable number, because it can be changed into a prime (18243133) 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, 16681 + ... + 17740.

Almost surely, 2^18243130 is an apocalyptic number.

18243130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18243130 is a deficient number, since it is larger than the sum of its proper divisors (15215054).

18243130 is a wasteful number, since it uses less digits than its factorization.

18243130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34481.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18243130 is about 4271.1977242923. The cubic root of 18243130 is about 263.2488307973.

The spelling of 18243130 in words is "eighteen million, two hundred forty-three thousand, one hundred thirty".