18030138 has 32 divisors (see below), whose sum is σ = 42057600. Its totient is φ = 5150880.

The previous prime is 18030121. The next prime is 18030143. The reversal of 18030138 is 83103081.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2323 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (1314300).

Almost surely, 2^18030138 is an apocalyptic number.

18030138 is an abundant number, since it is smaller than the sum of its proper divisors (24027462).

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

18030138 is an equidigital number, since it uses as much as digits as its factorization.

18030138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787 (or 8773 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18030138 is about 4246.1909990013. The cubic root of 18030138 is about 262.2203243529.

The spelling of 18030138 in words is "eighteen million, thirty thousand, one hundred thirty-eight".