18130939 has 4 divisors (see below), whose sum is σ = 18715840. Its totient is φ = 17546040.

The previous prime is 18130933. The next prime is 18130943. The reversal of 18130939 is 93903181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93903181 = 23 ⋅4082747.

It is a cyclic number.

It is not a de Polignac number, because 18130939 - 2⁷ = 18130811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18130933) 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, 292404 + ... + 292465.

It is an arithmetic number, because the mean of its divisors is an integer number (4678960).

Almost surely, 2^18130939 is an apocalyptic number.

18130939 is a deficient number, since it is larger than the sum of its proper divisors (584901).

18130939 is an equidigital number, since it uses as much as digits as its factorization.

18130939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584900.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 18130939 is about 4258.0440345304. The cubic root of 18130939 is about 262.7080811199.

The spelling of 18130939 in words is "eighteen million, one hundred thirty thousand, nine hundred thirty-nine".