18322730 has 16 divisors (see below), whose sum is σ = 33748704. Its totient is φ = 7158480.

The previous prime is 18322729. The next prime is 18322747. The reversal of 18322730 is 3722381.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18322730.

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, 20876 + ... + 21735.

It is an arithmetic number, because the mean of its divisors is an integer number (2109294).

Almost surely, 2^18322730 is an apocalyptic number.

18322730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18322730 is a deficient number, since it is larger than the sum of its proper divisors (15425974).

18322730 is a wasteful number, since it uses less digits than its factorization.

18322730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42661.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 18322730 is about 4280.5058112331. The cubic root of 18322730 is about 263.6311519526.

The spelling of 18322730 in words is "eighteen million, three hundred twenty-two thousand, seven hundred thirty".