18982139 has 8 divisors (see below), whose sum is σ = 21213360. Its totient is φ = 16835200.

The previous prime is 18982127. The next prime is 18982141. The reversal of 18982139 is 93128981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18982139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18982096 and 18982105.

It is not an unprimeable number, because it can be changed into a prime (18982169) 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 7 ways as a sum of consecutive naturals, for example, 20594 + ... + 21495.

It is an arithmetic number, because the mean of its divisors is an integer number (2651670).

Almost surely, 2^18982139 is an apocalyptic number.

18982139 is a deficient number, since it is larger than the sum of its proper divisors (2231221).

18982139 is a wasteful number, since it uses less digits than its factorization.

18982139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42141.

The product of its digits is 31104, while the sum is 41.

The square root of 18982139 is about 4356.8496646086. The cubic root of 18982139 is about 266.7565240581.

It can be divided in two parts, 189 and 82139, that added together give a palindrome (82328).

The spelling of 18982139 in words is "eighteen million, nine hundred eighty-two thousand, one hundred thirty-nine".