18479321 has 6 divisors (see below), whose sum is σ = 21496410. Its totient is φ = 15839376.

The previous prime is 18479311. The next prime is 18479353. The reversal of 18479321 is 12397481.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 1132096 = 4165^2 + 1064^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18479321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18479311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188516 + ... + 188613.

It is an arithmetic number, because the mean of its divisors is an integer number (3582735).

Almost surely, 2^18479321 is an apocalyptic number.

It is an amenable number.

18479321 is a deficient number, since it is larger than the sum of its proper divisors (3017089).

18479321 is an equidigital number, since it uses as much as digits as its factorization.

18479321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377143 (or 377136 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 18479321 is about 4298.7580764681. The cubic root of 18479321 is about 264.3800435896.

The spelling of 18479321 in words is "eighteen million, four hundred seventy-nine thousand, three hundred twenty-one".