100399 has 4 divisors (see below), whose sum is σ = 108136. Its totient is φ = 92664.

The previous prime is 100393. The next prime is 100403. The reversal of 100399 is 993001.

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

It is not a de Polignac number, because 100399 - 2³ = 100391 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 (100391) 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, 3849 + ... + 3874.

It is an arithmetic number, because the mean of its divisors is an integer number (27034).

2¹⁰⁰³⁹⁹ is an apocalyptic number.

100399 is a deficient number, since it is larger than the sum of its proper divisors (7737).

100399 is an equidigital number, since it uses as much as digits as its factorization.

100399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7736.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 100399 is about 316.8580123652. The cubic root of 100399 is about 46.4775395441.

The spelling of 100399 in words is "one hundred thousand, three hundred ninety-nine".