18120530 has 8 divisors (see below), whose sum is σ = 32616972. Its totient is φ = 7248208.

The previous prime is 18120517. The next prime is 18120559. The reversal of 18120530 is 3502181.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 83521 = 4247^2 + 289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 906017 + ... + 906036.

Almost surely, 2^18120530 is an apocalyptic number.

18120530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18120530 is a deficient number, since it is larger than the sum of its proper divisors (14496442).

18120530 is a wasteful number, since it uses less digits than its factorization.

18120530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812060.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 18120530 is about 4256.8215842339. The cubic root of 18120530 is about 262.6577977915.

The spelling of 18120530 in words is "eighteen million, one hundred twenty thousand, five hundred thirty".