195749 has 4 divisors (see below), whose sum is σ = 199020. Its totient is φ = 192480.

The previous prime is 195743. The next prime is 195751. The reversal of 195749 is 947591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947591 = 43 ⋅22037.

It can be written as a sum of positive squares in 2 ways, for example, as 47524 + 148225 = 218^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 195749 - 2⁴ = 195733 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544 + ... + 1665.

It is an arithmetic number, because the mean of its divisors is an integer number (49755).

2¹⁹⁵⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

195749 is a deficient number, since it is larger than the sum of its proper divisors (3271).

195749 is an equidigital number, since it uses as much as digits as its factorization.

195749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its digits is 11340, while the sum is 35.

The square root of 195749 is about 442.4353060053. The cubic root of 195749 is about 58.0630507363.

The spelling of 195749 in words is "one hundred ninety-five thousand, seven hundred forty-nine".