83999 has 4 divisors (see below), whose sum is σ = 88440. Its totient is φ = 79560.

The previous prime is 83987. The next prime is 84011. The reversal of 83999 is 99938.

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

It is an interprime number because it is at equal distance from previous prime (83987) and next prime (84011).

It is a cyclic number.

It is not a de Polignac number, because 83999 - 2⁴ = 83983 is a prime.

It is a Duffinian number.

83999 is a modest number, since divided by 999 gives 83 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83939) 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, 2192 + ... + 2229.

It is an arithmetic number, because the mean of its divisors is an integer number (22110).

2⁸³⁹⁹⁹ is an apocalyptic number.

83999 is a deficient number, since it is larger than the sum of its proper divisors (4441).

83999 is a wasteful number, since it uses less digits than its factorization.

83999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440.

The product of its digits is 17496, while the sum is 38.

The square root of 83999 is about 289.8258097548. The cubic root of 83999 is about 43.7950176077.

The spelling of 83999 in words is "eighty-three thousand, nine hundred ninety-nine".