18434423 has 4 divisors (see below), whose sum is σ = 21067920. Its totient is φ = 15800928.

The previous prime is 18434417. The next prime is 18434483. The reversal of 18434423 is 32443481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32443481 = 7 ⋅4634783.

It is a cyclic number.

It is not a de Polignac number, because 18434423 - 2⁶ = 18434359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434483) 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 3 ways as a sum of consecutive naturals, for example, 1316738 + ... + 1316751.

It is an arithmetic number, because the mean of its divisors is an integer number (5266980).

Almost surely, 2^18434423 is an apocalyptic number.

18434423 is a deficient number, since it is larger than the sum of its proper divisors (2633497).

18434423 is an equidigital number, since it uses as much as digits as its factorization.

18434423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633496.

The product of its digits is 9216, while the sum is 29.

The square root of 18434423 is about 4293.5326946467. The cubic root of 18434423 is about 264.1657543027.

The spelling of 18434423 in words is "eighteen million, four hundred thirty-four thousand, four hundred twenty-three".