18669423 has 8 divisors (see below), whose sum is σ = 25565488. Its totient is φ = 12109824.

The previous prime is 18669403. The next prime is 18669433. The reversal of 18669423 is 32496681.

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

It is not a de Polignac number, because 18669423 - 2¹² = 18665327 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 (18669403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83986 + ... + 84207.

It is an arithmetic number, because the mean of its divisors is an integer number (3195686).

Almost surely, 2^18669423 is an apocalyptic number.

18669423 is a deficient number, since it is larger than the sum of its proper divisors (6896065).

18669423 is a wasteful number, since it uses less digits than its factorization.

18669423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168233.

The product of its digits is 62208, while the sum is 39.

The square root of 18669423 is about 4320.8127707643. The cubic root of 18669423 is about 265.2835365600.

It can be divided in two parts, 18669 and 423, that multiplied together give a palindrome (7896987).

The spelling of 18669423 in words is "eighteen million, six hundred sixty-nine thousand, four hundred twenty-three".