18829209 has 32 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 9936000.

The previous prime is 18829177. The next prime is 18829243. The reversal of 18829209 is 90292881.

It is not a de Polignac number, because 18829209 - 2⁵ = 18829177 is a prime.

It is a super-2 number, since 2×18829209² = 709078223131362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18829259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15784 + ... + 16934.

It is an arithmetic number, because the mean of its divisors is an integer number (967680).

Almost surely, 2^18829209 is an apocalyptic number.

18829209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18829209 is a deficient number, since it is larger than the sum of its proper divisors (12136551).

18829209 is a wasteful number, since it uses less digits than its factorization.

18829209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18829209 is about 4339.2636472102. The cubic root of 18829209 is about 266.0382150609.

The spelling of 18829209 in words is "eighteen million, eight hundred twenty-nine thousand, two hundred nine".