18558229 has 4 divisors (see below), whose sum is σ = 18665676. Its totient is φ = 18450784.

The previous prime is 18558179. The next prime is 18558233. The reversal of 18558229 is 92285581.

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 8254129 + 10304100 = 2873^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 18558229 - 2⁹ = 18557717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18558191 and 18558200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18558259) 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, 53464 + ... + 53809.

It is an arithmetic number, because the mean of its divisors is an integer number (4666419).

Almost surely, 2^18558229 is an apocalyptic number.

It is an amenable number.

18558229 is a deficient number, since it is larger than the sum of its proper divisors (107447).

18558229 is a wasteful number, since it uses less digits than its factorization.

18558229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107446.

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

The square root of 18558229 is about 4307.9262992767. The cubic root of 18558229 is about 264.7558163625.

The spelling of 18558229 in words is "eighteen million, five hundred fifty-eight thousand, two hundred twenty-nine".