83989 has 4 divisors (see below), whose sum is σ = 85824. Its totient is φ = 82156.

The previous prime is 83987. The next prime is 84011. The reversal of 83989 is 98938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83989 - 2¹ = 83987 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 (83983) 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, 847 + ... + 940.

It is an arithmetic number, because the mean of its divisors is an integer number (21456).

2⁸³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

83989 is a deficient number, since it is larger than the sum of its proper divisors (1835).

83989 is a wasteful number, since it uses less digits than its factorization.

83989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834.

The product of its digits is 15552, while the sum is 37.

The square root of 83989 is about 289.8085574996. The cubic root of 83989 is about 43.7932796206.

The spelling of 83989 in words is "eighty-three thousand, nine hundred eighty-nine".