18855229 has 4 divisors (see below), whose sum is σ = 18975484. Its totient is φ = 18734976.

The previous prime is 18855209. The next prime is 18855233. The reversal of 18855229 is 92255881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2839225 + 16016004 = 1685^2 + 4002^2 .

It is a cyclic number.

It is not a de Polignac number, because 18855229 - 2⁵ = 18855197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18855191 and 18855200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18855209) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59892 + ... + 60205.

It is an arithmetic number, because the mean of its divisors is an integer number (4743871).

Almost surely, 2^18855229 is an apocalyptic number.

It is an amenable number.

18855229 is a deficient number, since it is larger than the sum of its proper divisors (120255).

18855229 is a wasteful number, since it uses less digits than its factorization.

18855229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120254.

The product of its digits is 57600, while the sum is 40.

The square root of 18855229 is about 4342.2608166714. The cubic root of 18855229 is about 266.1607043304.

The spelling of 18855229 in words is "eighteen million, eight hundred fifty-five thousand, two hundred twenty-nine".