18213229 has 8 divisors (see below), whose sum is σ = 19363680. Its totient is φ = 17082000.

The previous prime is 18213211. The next prime is 18213233. The reversal of 18213229 is 92231281.

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

It is a cyclic number.

It is not a de Polignac number, because 18213229 - 2⁷ = 18213101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18213197 and 18213206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2827 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (2420460).

Almost surely, 2^18213229 is an apocalyptic number.

18213229 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18213229 is a deficient number, since it is larger than the sum of its proper divisors (1150451).

18213229 is a wasteful number, since it uses less digits than its factorization.

18213229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611.

The product of its digits is 1728, while the sum is 28.

The square root of 18213229 is about 4267.6959826117. The cubic root of 18213229 is about 263.1049280845.

It can be divided in two parts, 1821 and 3229, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 18213229 in words is "eighteen million, two hundred thirteen thousand, two hundred twenty-nine".