18323506 has 4 divisors (see below), whose sum is σ = 27485262. Its totient is φ = 9161752.

The previous prime is 18323489. The next prime is 18323519. The reversal of 18323506 is 60532381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 4447881 = 3725^2 + 2109^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4580875 + ... + 4580878.

Almost surely, 2^18323506 is an apocalyptic number.

18323506 is a deficient number, since it is larger than the sum of its proper divisors (9161756).

18323506 is an equidigital number, since it uses as much as digits as its factorization.

18323506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9161755.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 18323506 is about 4280.5964537667. The cubic root of 18323506 is about 263.6348736485.

Adding to 18323506 its reverse (60532381), we get a palindrome (78855887).

The spelling of 18323506 in words is "eighteen million, three hundred twenty-three thousand, five hundred six".