197649 has 6 divisors (see below), whose sum is σ = 285506. Its totient is φ = 131760.

The previous prime is 197647. The next prime is 197651. The reversal of 197649 is 946791.

197649 is a `hidden beast` number, since 1 + 9 + 7 + 649 = 666.

197649 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (197647) and next prime (197651).

It can be written as a sum of positive squares in only one way, i.e., 186624 + 11025 = 432^2 + 105^2 .

It is not a de Polignac number, because 197649 - 2¹ = 197647 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (197641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10972 + ... + 10989.

2¹⁹⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

197649 is a deficient number, since it is larger than the sum of its proper divisors (87857).

197649 is a wasteful number, since it uses less digits than its factorization.

197649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21967 (or 21964 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 197649 is about 444.5773273571. The cubic root of 197649 is about 58.2503054624.

Subtracting from 197649 its product of digits (13608), we obtain a square (184041 = 429²).

It can be divided in two parts, 1976 and 49, that added together give a square (2025 = 45²).

The spelling of 197649 in words is "one hundred ninety-seven thousand, six hundred forty-nine".