18320939 has 8 divisors (see below), whose sum is σ = 22548960. Its totient is φ = 14495616.

The previous prime is 18320933. The next prime is 18320947. The reversal of 18320939 is 93902381.

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

It is a cyclic number.

It is not a de Polignac number, because 18320939 - 2¹⁶ = 18255403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18320899 and 18320908.

It is not an unprimeable number, because it can be changed into a prime (18320933) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 100574 + ... + 100755.

It is an arithmetic number, because the mean of its divisors is an integer number (2818620).

Almost surely, 2^18320939 is an apocalyptic number.

18320939 is a deficient number, since it is larger than the sum of its proper divisors (4228021).

18320939 is a wasteful number, since it uses less digits than its factorization.

18320939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201349.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 18320939 is about 4280.2966018724. The cubic root of 18320939 is about 263.6225619157.

The spelling of 18320939 in words is "eighteen million, three hundred twenty thousand, nine hundred thirty-nine".