18822139 has 4 divisors (see below), whose sum is σ = 21511024. Its totient is φ = 16133256.

The previous prime is 18822091. The next prime is 18822143. The reversal of 18822139 is 93122881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93122881 = 499 ⋅186619.

It is a cyclic number.

It is not a de Polignac number, because 18822139 - 2¹³ = 18813947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18825139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344432 + ... + 1344445.

It is an arithmetic number, because the mean of its divisors is an integer number (5377756).

Almost surely, 2^18822139 is an apocalyptic number.

18822139 is a deficient number, since it is larger than the sum of its proper divisors (2688885).

18822139 is an equidigital number, since it uses as much as digits as its factorization.

18822139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688884.

The product of its digits is 6912, while the sum is 34.

The square root of 18822139 is about 4338.4489163755. The cubic root of 18822139 is about 266.0049135090.

The spelling of 18822139 in words is "eighteen million, eight hundred twenty-two thousand, one hundred thirty-nine".