15749 has 2 divisors, whose sum is σ = 15750.
Its totient is φ = 15748.
The previous prime is 15739. The next prime is 15761. The reversal of 15749 is 94751.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 9025 + 6724 = 95^2 + 82^2
It is a cyclic number.
It is not a de Polignac number, because 15749 - 24 = 15733 is a prime.
It is a Chen prime.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (15739) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7874 + 7875.
It is an arithmetic number, because the mean of its divisors is an integer number (7875).
215749 is an apocalyptic number.
It is an amenable number.
15749 is a deficient number, since it is larger than the sum of its proper divisors (1).
15749 is an equidigital number, since it uses as much as digits as its factorization.
15749 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1260, while the sum is 26.
The square root of 15749 is about 125.4950198215.
The cubic root of 15749 is about 25.0659591559.
The spelling of 15749 in words is "fifteen thousand, seven hundred forty-nine".