18480239 has 4 divisors (see below), whose sum is σ = 18910056. Its totient is φ = 18050424.

The previous prime is 18480229. The next prime is 18480251. The reversal of 18480239 is 93208481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93208481 = 673 ⋅138497.

It is a cyclic number.

It is not a de Polignac number, because 18480239 - 2²⁰ = 17431663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18480199 and 18480208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18480229) 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, 214844 + ... + 214929.

It is an arithmetic number, because the mean of its divisors is an integer number (4727514).

Almost surely, 2^18480239 is an apocalyptic number.

18480239 is a deficient number, since it is larger than the sum of its proper divisors (429817).

18480239 is an equidigital number, since it uses as much as digits as its factorization.

18480239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429816.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18480239 is about 4298.8648501668. The cubic root of 18480239 is about 264.3844213995.

The spelling of 18480239 in words is "eighteen million, four hundred eighty thousand, two hundred thirty-nine".