18899423 has 4 divisors (see below), whose sum is σ = 19086648. Its totient is φ = 18712200.

The previous prime is 18899381. The next prime is 18899449. The reversal of 18899423 is 32499881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18899423 - 2¹⁸ = 18637279 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 (18893423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93461 + ... + 93662.

It is an arithmetic number, because the mean of its divisors is an integer number (4771662).

Almost surely, 2^18899423 is an apocalyptic number.

18899423 is a deficient number, since it is larger than the sum of its proper divisors (187225).

18899423 is a wasteful number, since it uses less digits than its factorization.

18899423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187224.

The product of its digits is 124416, while the sum is 44.

The square root of 18899423 is about 4347.3466620457. The cubic root of 18899423 is about 266.3684898041.

The spelling of 18899423 in words is "eighteen million, eight hundred ninety-nine thousand, four hundred twenty-three".