97989 has 8 divisors (see below), whose sum is σ = 132480. Its totient is φ = 64416.

The previous prime is 97987. The next prime is 98009. The reversal of 97989 is 98979.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97989 - 2¹ = 97987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84 + ... + 450.

It is an arithmetic number, because the mean of its divisors is an integer number (16560).

2⁹⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

97989 is a deficient number, since it is larger than the sum of its proper divisors (34491).

97989 is a wasteful number, since it uses less digits than its factorization.

97989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its digits is 40824, while the sum is 42.

The square root of 97989 is about 313.0319472514. The cubic root of 97989 is about 46.1026378629.

Subtracting 97989 from its reverse (98979), we obtain a triangular number (990 = T₄₄).

The spelling of 97989 in words is "ninety-seven thousand, nine hundred eighty-nine".