18334421 has 16 divisors (see below), whose sum is σ = 21641088. Its totient is φ = 15206400.

The previous prime is 18334417. The next prime is 18334447. The reversal of 18334421 is 12443381.

It is a cyclic number.

It is not a de Polignac number, because 18334421 - 2² = 18334417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18334321) 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, 55226 + ... + 55556.

It is an arithmetic number, because the mean of its divisors is an integer number (1352568).

Almost surely, 2^18334421 is an apocalyptic number.

It is an amenable number.

18334421 is a deficient number, since it is larger than the sum of its proper divisors (3306667).

18334421 is a wasteful number, since it uses less digits than its factorization.

18334421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its digits is 2304, while the sum is 26.

The square root of 18334421 is about 4281.8712031074. The cubic root of 18334421 is about 263.6872108570.

The spelling of 18334421 in words is "eighteen million, three hundred thirty-four thousand, four hundred twenty-one".