18213423 has 8 divisors (see below), whose sum is σ = 24307200. Its totient is φ = 12130968.

The previous prime is 18213383. The next prime is 18213449. The reversal of 18213423 is 32431281.

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

It is not a de Polignac number, because 18213423 - 2¹⁶ = 18147887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18213393 and 18213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2208 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (3038400).

Almost surely, 2^18213423 is an apocalyptic number.

18213423 is a deficient number, since it is larger than the sum of its proper divisors (6093777).

18213423 is a wasteful number, since it uses less digits than its factorization.

18213423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661.

The product of its digits is 1152, while the sum is 24.

The square root of 18213423 is about 4267.7187114429. The cubic root of 18213423 is about 263.1058622439.

The spelling of 18213423 in words is "eighteen million, two hundred thirteen thousand, four hundred twenty-three".