18826109 has 4 divisors (see below), whose sum is σ = 18834816. Its totient is φ = 18817404.

The previous prime is 18826103. The next prime is 18826111. The reversal of 18826109 is 90162881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90162881 = 1511 ⋅59671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18826109 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 (18826103) 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, 1652 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (4708704).

Almost surely, 2^18826109 is an apocalyptic number.

It is an amenable number.

18826109 is a deficient number, since it is larger than the sum of its proper divisors (8707).

18826109 is an equidigital number, since it uses as much as digits as its factorization.

18826109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8706.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18826109 is about 4338.9064290441. The cubic root of 18826109 is about 266.0236142753.

The spelling of 18826109 in words is "eighteen million, eight hundred twenty-six thousand, one hundred nine".