18872839 has 4 divisors (see below), whose sum is σ = 19983024. Its totient is φ = 17762656.

The previous prime is 18872827. The next prime is 18872911. The reversal of 18872839 is 93827881.

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

It is a cyclic number.

It is not a de Polignac number, because 18872839 - 2¹⁵ = 18840071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872809) 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, 555067 + ... + 555100.

It is an arithmetic number, because the mean of its divisors is an integer number (4995756).

Almost surely, 2^18872839 is an apocalyptic number.

18872839 is a deficient number, since it is larger than the sum of its proper divisors (1110185).

18872839 is a wasteful number, since it uses less digits than its factorization.

18872839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110184.

The product of its digits is 193536, while the sum is 46.

The square root of 18872839 is about 4344.2880889738. The cubic root of 18872839 is about 266.2435395583.

The spelling of 18872839 in words is "eighteen million, eight hundred seventy-two thousand, eight hundred thirty-nine".