18159530 has 16 divisors (see below), whose sum is σ = 32749704. Its totient is φ = 7249920.

The previous prime is 18159529. The next prime is 18159569. The reversal of 18159530 is 3595181.

It can be written as a sum of positive squares in 4 ways, for example, as 16736281 + 1423249 = 4091^2 + 1193^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4994 + ... + 7826.

Almost surely, 2^18159530 is an apocalyptic number.

18159530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18159530 is a deficient number, since it is larger than the sum of its proper divisors (14590174).

18159530 is a wasteful number, since it uses less digits than its factorization.

18159530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 18159530 is about 4261.4000046933. The cubic root of 18159530 is about 262.8460982791.

The spelling of 18159530 in words is "eighteen million, one hundred fifty-nine thousand, five hundred thirty".