18105530 has 8 divisors (see below), whose sum is σ = 32589972. Its totient is φ = 7242208.

The previous prime is 18105473. The next prime is 18105539. The reversal of 18105530 is 3550181.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 51529 = 4249^2 + 227^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18105496 and 18105505.

It is not an unprimeable number, because it can be changed into a prime (18105539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905267 + ... + 905286.

Almost surely, 2^18105530 is an apocalyptic number.

18105530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18105530 is a deficient number, since it is larger than the sum of its proper divisors (14484442).

18105530 is a wasteful number, since it uses less digits than its factorization.

18105530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810560.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 18105530 is about 4255.0593415368. The cubic root of 18105530 is about 262.5853025868.

The spelling of 18105530 in words is "eighteen million, one hundred five thousand, five hundred thirty".