18814399 has 4 divisors (see below), whose sum is σ = 18827640. Its totient is φ = 18801160.

The previous prime is 18814339. The next prime is 18814423. The reversal of 18814399 is 99341881.

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 18814399 - 2²¹ = 16717247 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 (18814339) 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, 4192 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (4706910).

Almost surely, 2^18814399 is an apocalyptic number.

18814399 is a deficient number, since it is larger than the sum of its proper divisors (13241).

18814399 is a wasteful number, since it uses less digits than its factorization.

18814399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13240.

The product of its digits is 62208, while the sum is 43.

The square root of 18814399 is about 4337.5568007808. The cubic root of 18814399 is about 265.9684465182.

The spelling of 18814399 in words is "eighteen million, eight hundred fourteen thousand, three hundred ninety-nine".