10399 has 2 divisors, whose sum is σ = 10400.
Its totient is φ = 10398.
The previous prime is 10391. The next prime is 10427. The reversal of 10399 is 99301.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 10399 - 23 = 10391 is a prime.
It is a Chen prime.
10399 is a lucky number.
It is a plaindrome in base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (10391) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199 + 5200.
It is an arithmetic number, because the mean of its divisors is an integer number (5200).
210399 is an apocalyptic number.
10399 is a deficient number, since it is larger than the sum of its proper divisors (1).
10399 is an equidigital number, since it uses as much as digits as its factorization.
10399 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 243, while the sum is 22.
The square root of 10399 is about 101.9754872506.
The cubic root of 10399 is about 21.8271580280.
It can be divided in two parts, 103 and 99, that added together give a palindrome (202).
The spelling of 10399 in words is "ten thousand, three hundred ninety-nine".