18434181 has 16 divisors (see below), whose sum is σ = 25487360. Its totient is φ = 11838960.

The previous prime is 18434153. The next prime is 18434203. The reversal of 18434181 is 18143481.

It is not a de Polignac number, because 18434181 - 2¹¹ = 18432133 is a prime.

It is a super-2 number, since 2×18434181² = 679638058281522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434081) 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, 34986 + ... + 35508.

It is an arithmetic number, because the mean of its divisors is an integer number (1592960).

Almost surely, 2^18434181 is an apocalyptic number.

It is an amenable number.

18434181 is a deficient number, since it is larger than the sum of its proper divisors (7053179).

18434181 is a wasteful number, since it uses less digits than its factorization.

18434181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its digits is 3072, while the sum is 30.

The square root of 18434181 is about 4293.5045126330. The cubic root of 18434181 is about 264.1645983423.

The spelling of 18434181 in words is "eighteen million, four hundred thirty-four thousand, one hundred eighty-one".