19399 has 4 divisors (see below), whose sum is σ = 20440. Its totient is φ = 18360.

The previous prime is 19391. The next prime is 19403. The reversal of 19399 is 99391.

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 19399 - 2³ = 19391 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 19399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19391) 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, 492 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (5110).

2¹⁹³⁹⁹ is an apocalyptic number.

19399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19399 is a deficient number, since it is larger than the sum of its proper divisors (1041).

19399 is a wasteful number, since it uses less digits than its factorization.

19399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its digits is 2187, while the sum is 31.

The square root of 19399 is about 139.2802929348. The cubic root of 19399 is about 26.8695121299.

It can be divided in two parts, 193 and 99, that added together give a palindrome (292).

The spelling of 19399 in words is "nineteen thousand, three hundred ninety-nine".