18258139 has 4 divisors (see below), whose sum is σ = 18887760. Its totient is φ = 17628520.

The previous prime is 18258109. The next prime is 18258143. The reversal of 18258139 is 93185281.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18258139 - 2⁹ = 18257627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18258098 and 18258107.

It is not an unprimeable number, because it can be changed into a prime (18258109) 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 3 ways as a sum of consecutive naturals, for example, 314767 + ... + 314824.

It is an arithmetic number, because the mean of its divisors is an integer number (4721940).

Almost surely, 2^18258139 is an apocalyptic number.

18258139 is a deficient number, since it is larger than the sum of its proper divisors (629621).

18258139 is an equidigital number, since it uses as much as digits as its factorization.

18258139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629620.

The product of its digits is 17280, while the sum is 37.

The square root of 18258139 is about 4272.9543643713. The cubic root of 18258139 is about 263.3210044255.

The spelling of 18258139 in words is "eighteen million, two hundred fifty-eight thousand, one hundred thirty-nine".