18434 has 8 divisors (see below), whose sum is σ = 29820. Its totient is φ = 8496.

The previous prime is 18433. The next prime is 18439. The reversal of 18434 is 43481.

18434 = T₉₄ + T₉₅ + ... + T₉₇.

It can be written as a sum of positive squares in 2 ways, for example, as 15625 + 2809 = 125^2 + 53^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329 + ... + 380.

2¹⁸⁴³⁴ is an apocalyptic number.

18434 is a deficient number, since it is larger than the sum of its proper divisors (11386).

18434 is a wasteful number, since it uses less digits than its factorization.

18434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 384, while the sum is 20.

The square root of 18434 is about 135.7718674837. The cubic root of 18434 is about 26.4163733754.

The spelling of 18434 in words is "eighteen thousand, four hundred thirty-four".