18705423 has 16 divisors (see below), whose sum is σ = 28809216. Its totient is φ = 10669440.

The previous prime is 18705409. The next prime is 18705439. The reversal of 18705423 is 32450781.

It is not a de Polignac number, because 18705423 - 2²⁴ = 1928207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705023) 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, 16111 + ... + 17232.

It is an arithmetic number, because the mean of its divisors is an integer number (1800576).

Almost surely, 2^18705423 is an apocalyptic number.

18705423 is a deficient number, since it is larger than the sum of its proper divisors (10103793).

18705423 is a wasteful number, since it uses less digits than its factorization.

18705423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33374.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18705423 is about 4324.9766473358. The cubic root of 18705423 is about 265.4539413153.

The spelling of 18705423 in words is "eighteen million, seven hundred five thousand, four hundred twenty-three".