18308039 has 4 divisors (see below), whose sum is σ = 19271640. Its totient is φ = 17344440.

The previous prime is 18308029. The next prime is 18308053. The reversal of 18308039 is 93080381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93080381 = 859 ⋅108359.

It is a cyclic number.

It is not a de Polignac number, because 18308039 - 2¹⁶ = 18242503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18307996 and 18308014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308029) 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, 481772 + ... + 481809.

It is an arithmetic number, because the mean of its divisors is an integer number (4817910).

Almost surely, 2^18308039 is an apocalyptic number.

18308039 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18308039 is a deficient number, since it is larger than the sum of its proper divisors (963601).

18308039 is an equidigital number, since it uses as much as digits as its factorization.

18308039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963600.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18308039 is about 4278.7894316033. The cubic root of 18308039 is about 263.5606740848.

The spelling of 18308039 in words is "eighteen million, three hundred eight thousand, thirty-nine".