18156229 has 16 divisors (see below), whose sum is σ = 23524480. Its totient is φ = 13608000.

The previous prime is 18156227. The next prime is 18156251. The reversal of 18156229 is 92265181.

It is not a de Polignac number, because 18156229 - 2¹ = 18156227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18156194 and 18156203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3522 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (1470280).

Almost surely, 2^18156229 is an apocalyptic number.

18156229 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18156229 is a deficient number, since it is larger than the sum of its proper divisors (5368251).

18156229 is a wasteful number, since it uses less digits than its factorization.

18156229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540.

The product of its digits is 8640, while the sum is 34.

The square root of 18156229 is about 4261.0126730626. The cubic root of 18156229 is about 262.8301707826.

The spelling of 18156229 in words is "eighteen million, one hundred fifty-six thousand, two hundred twenty-nine".