197749 has 4 divisors (see below), whose sum is σ = 204160. Its totient is φ = 191340.

The previous prime is 197741. The next prime is 197753. The reversal of 197749 is 947791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947791 = 13 ⋅72907.

It is a cyclic number.

It is not a de Polignac number, because 197749 - 2³ = 197741 is a prime.

It is a Duffinian number.

197749 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197741) 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, 3159 + ... + 3220.

It is an arithmetic number, because the mean of its divisors is an integer number (51040).

2¹⁹⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

197749 is a deficient number, since it is larger than the sum of its proper divisors (6411).

197749 is an equidigital number, since it uses as much as digits as its factorization.

197749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410.

The product of its digits is 15876, while the sum is 37.

The square root of 197749 is about 444.6897795093. The cubic root of 197749 is about 58.2601276698.

It can be divided in two parts, 197 and 749, that added together give a triangular number (946 = T₄₃).

The spelling of 197749 in words is "one hundred ninety-seven thousand, seven hundred forty-nine".