18208229 has 6 divisors (see below), whose sum is σ = 19716786. Its totient is φ = 16807440.

The previous prime is 18208189. The next prime is 18208231. The reversal of 18208229 is 92280281.

It can be written as a sum of positive squares in 3 ways, for example, as 1151329 + 17056900 = 1073^2 + 4130^2 .

It is not a de Polignac number, because 18208229 - 2¹² = 18204133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18208195 and 18208204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53702 + ... + 54039.

It is an arithmetic number, because the mean of its divisors is an integer number (3286131).

Almost surely, 2^18208229 is an apocalyptic number.

It is an amenable number.

18208229 is a deficient number, since it is larger than the sum of its proper divisors (1508557).

18208229 is a wasteful number, since it uses less digits than its factorization.

18208229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107767 (or 107754 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18208229 is about 4267.1101462231. The cubic root of 18208229 is about 263.0808495234.

The spelling of 18208229 in words is "eighteen million, two hundred eight thousand, two hundred twenty-nine".