18985423 has 8 divisors (see below), whose sum is σ = 19652096. Its totient is φ = 18322200.

The previous prime is 18985409. The next prime is 18985429. The reversal of 18985423 is 32458981.

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

It is a cyclic number.

It is not a de Polignac number, because 18985423 - 2²¹ = 16888271 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 (18985429) 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 7 ways as a sum of consecutive naturals, for example, 15628 + ... + 16798.

It is an arithmetic number, because the mean of its divisors is an integer number (2456512).

Almost surely, 2^18985423 is an apocalyptic number.

18985423 is a deficient number, since it is larger than the sum of its proper divisors (666673).

18985423 is a wasteful number, since it uses less digits than its factorization.

18985423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its digits is 69120, while the sum is 40.

The square root of 18985423 is about 4357.2265261287. The cubic root of 18985423 is about 266.7719065519.

The spelling of 18985423 in words is "eighteen million, nine hundred eighty-five thousand, four hundred twenty-three".