208399 has 4 divisors (see below), whose sum is σ = 209440. Its totient is φ = 207360.

The previous prime is 208393. The next prime is 208409. The reversal of 208399 is 993802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 993802 = 2 ⋅496901.

It is a cyclic number.

It is not a de Polignac number, because 208399 - 2³ = 208391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208391) 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, 114 + ... + 655.

It is an arithmetic number, because the mean of its divisors is an integer number (52360).

2²⁰⁸³⁹⁹ is an apocalyptic number.

208399 is a deficient number, since it is larger than the sum of its proper divisors (1041).

208399 is an equidigital number, since it uses as much as digits as its factorization.

208399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 208399 is about 456.5073931493. The cubic root of 208399 is about 59.2877829359.

The spelling of 208399 in words is "two hundred eight thousand, three hundred ninety-nine".