18823109 has 6 divisors (see below), whose sum is σ = 19187826. Its totient is φ = 18465200.

The previous prime is 18823087. The next prime is 18823111. The reversal of 18823109 is 90132881.

It can be written as a sum of positive squares in 3 ways, for example, as 5522500 + 13300609 = 2350^2 + 3647^2 .

It is not a de Polignac number, because 18823109 - 2¹² = 18819013 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 (18823159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 542 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (3197971).

Almost surely, 2^18823109 is an apocalyptic number.

It is an amenable number.

18823109 is a deficient number, since it is larger than the sum of its proper divisors (364717).

18823109 is an frugal number, since it uses more digits than its factorization.

18823109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6807 (or 6754 counting only the distinct ones).

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

The square root of 18823109 is about 4338.5607060407. The cubic root of 18823109 is about 266.0094829566.

The spelling of 18823109 in words is "eighteen million, eight hundred twenty-three thousand, one hundred nine".