98765 has 4 divisors (see below), whose sum is σ = 118524. Its totient is φ = 79008.

The previous prime is 98737. The next prime is 98773. The reversal of 98765 is 56789.

98765 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56789 = 109 ⋅521.

It can be written as a sum of positive squares in 2 ways, for example, as 31684 + 67081 = 178^2 + 259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98765 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a straight-line number, since its digits are in arithmetic progression.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 98765.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9872 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (29631).

2⁹⁸⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

98765 is a deficient number, since it is larger than the sum of its proper divisors (19759).

98765 is a wasteful number, since it uses less digits than its factorization.

98765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19758.

The product of its digits is 15120, while the sum is 35.

The square root of 98765 is about 314.2689930617. The cubic root of 98765 is about 46.2240175465.

The spelling of 98765 in words is "ninety-eight thousand, seven hundred sixty-five".