18209955 has 16 divisors (see below), whose sum is σ = 29250720. Its totient is φ = 9673728.

The previous prime is 18209953. The next prime is 18209963. The reversal of 18209955 is 55990281.

It is not a de Polignac number, because 18209955 - 2¹ = 18209953 is a prime.

It is a super-2 number, since 2×18209955² = 663204922204050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18209953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1779 + ... + 6291.

It is an arithmetic number, because the mean of its divisors is an integer number (1828170).

Almost surely, 2^18209955 is an apocalyptic number.

18209955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18209955 is a deficient number, since it is larger than the sum of its proper divisors (11040765).

18209955 is a wasteful number, since it uses less digits than its factorization.

18209955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 18209955 is about 4267.3123860341. The cubic root of 18209955 is about 263.0891619408.

The spelling of 18209955 in words is "eighteen million, two hundred nine thousand, nine hundred fifty-five".