18147839 has 2 divisors, whose sum is σ = 18147840. Its totient is φ = 18147838.

The previous prime is 18147769. The next prime is 18147841. The reversal of 18147839 is 93874181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18147839 - 2⁸ = 18147583 is a prime.

Together with 18147841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18147796 and 18147805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18147859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9073919 + 9073920.

It is an arithmetic number, because the mean of its divisors is an integer number (9073920).

Almost surely, 2^18147839 is an apocalyptic number.

18147839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147839 is an equidigital number, since it uses as much as digits as its factorization.

18147839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18147839 is about 4260.0280515508. The cubic root of 18147839 is about 262.7896799060.

The spelling of 18147839 in words is "eighteen million, one hundred forty-seven thousand, eight hundred thirty-nine".