99745 has 4 divisors (see below), whose sum is σ = 119700. Its totient is φ = 79792.

The previous prime is 99733. The next prime is 99761. The reversal of 99745 is 54799.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21904 + 77841 = 148^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 99745 - 2⁵ = 99713 is a prime.

99745 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 99745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9970 + ... + 9979.

It is an arithmetic number, because the mean of its divisors is an integer number (29925).

2⁹⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

99745 is a deficient number, since it is larger than the sum of its proper divisors (19955).

99745 is a wasteful number, since it uses less digits than its factorization.

99745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19954.

The product of its digits is 11340, while the sum is 34.

The square root of 99745 is about 315.8243182530. The cubic root of 99745 is about 46.3764012480.

The spelling of 99745 in words is "ninety-nine thousand, seven hundred forty-five".