15845 has 4 divisors (see below), whose sum is σ = 19020. Its totient is φ = 12672.

The previous prime is 15823. The next prime is 15859. The reversal of 15845 is 54851.

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 9604 + 6241 = 98^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 15845 - 2¹⁰ = 14821 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 15845.

It is a congruent number.

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, 1580 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (4755).

2¹⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

15845 is a deficient number, since it is larger than the sum of its proper divisors (3175).

15845 is an equidigital number, since it uses as much as digits as its factorization.

15845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174.

The product of its digits is 800, while the sum is 23.

The square root of 15845 is about 125.8769240171. The cubic root of 15845 is about 25.1167869164.

The spelling of 15845 in words is "fifteen thousand, eight hundred forty-five".