15705 has 12 divisors (see below), whose sum is σ = 27300. Its totient is φ = 8352.

The previous prime is 15683. The next prime is 15727. The reversal of 15705 is 50751.

It is a happy number.

15705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15683) and next prime (15727).

It can be written as a sum of positive squares in 2 ways, for example, as 8649 + 7056 = 93^2 + 84^2 .

It is not a de Polignac number, because 15705 - 2⁶ = 15641 is a prime.

It is an Ulam number.

It is a lonely number, since its distance to closest prime (15727) sets a new record.

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 15705.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130 + ... + 219.

It is an arithmetic number, because the mean of its divisors is an integer number (2275).

2¹⁵⁷⁰⁵ is an apocalyptic number.

15705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15705 is a deficient number, since it is larger than the sum of its proper divisors (11595).

15705 is a wasteful number, since it uses less digits than its factorization.

15705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 175, while the sum is 18.

The square root of 15705 is about 125.3195914452. The cubic root of 15705 is about 25.0425940553.

The spelling of 15705 in words is "fifteen thousand, seven hundred five".