18012839 has 4 divisors (see below), whose sum is σ = 19398456. Its totient is φ = 16627224.

The previous prime is 18012793. The next prime is 18012847. The reversal of 18012839 is 93821081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93821081 = 653 ⋅143677.

It is a cyclic number.

It is not a de Polignac number, because 18012839 - 2⁸ = 18012583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012889) 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, 692789 + ... + 692814.

It is an arithmetic number, because the mean of its divisors is an integer number (4849614).

Almost surely, 2^18012839 is an apocalyptic number.

18012839 is a deficient number, since it is larger than the sum of its proper divisors (1385617).

18012839 is a wasteful number, since it uses less digits than its factorization.

18012839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385616.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18012839 is about 4244.1535080626. The cubic root of 18012839 is about 262.1364351651.

The spelling of 18012839 in words is "eighteen million, twelve thousand, eight hundred thirty-nine".