15783 has 4 divisors (see below), whose sum is σ = 21048. Its totient is φ = 10520.

The previous prime is 15773. The next prime is 15787. The reversal of 15783 is 38751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38751 = 3 ⋅12917.

It is a cyclic number.

It is not a de Polignac number, because 15783 - 2⁴ = 15767 is a prime.

It is a D-number.

15783 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15787) 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, 2628 + ... + 2633.

It is an arithmetic number, because the mean of its divisors is an integer number (5262).

2¹⁵⁷⁸³ is an apocalyptic number.

15783 is a deficient number, since it is larger than the sum of its proper divisors (5265).

15783 is an equidigital number, since it uses as much as digits as its factorization.

15783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264.

The product of its digits is 840, while the sum is 24.

The square root of 15783 is about 125.6304103313. The cubic root of 15783 is about 25.0839842168.

It can be divided in two parts, 157 and 83, that multiplied together give a palindrome (13031).

The spelling of 15783 in words is "fifteen thousand, seven hundred eighty-three".