18226829 has 4 divisors (see below), whose sum is σ = 18719484. Its totient is φ = 17734176.

The previous prime is 18226807. The next prime is 18226843. The reversal of 18226829 is 92862281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92862281 = 307 ⋅302483.

It can be written as a sum of positive squares in 2 ways, for example, as 13912900 + 4313929 = 3730^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 18226829 - 2⁸ = 18226573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18226792 and 18226801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18222829) 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, 246272 + ... + 246345.

It is an arithmetic number, because the mean of its divisors is an integer number (4679871).

Almost surely, 2^18226829 is an apocalyptic number.

It is an amenable number.

18226829 is a deficient number, since it is larger than the sum of its proper divisors (492655).

18226829 is an equidigital number, since it uses as much as digits as its factorization.

18226829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492654.

The product of its digits is 27648, while the sum is 38.

The square root of 18226829 is about 4269.2890508842. The cubic root of 18226829 is about 263.1703994837.

Subtracting from 18226829 its product of digits (27648), we obtain a palindrome (18199181).

The spelling of 18226829 in words is "eighteen million, two hundred twenty-six thousand, eight hundred twenty-nine".