196781 has 4 divisors (see below), whose sum is σ = 211932. Its totient is φ = 181632.

The previous prime is 196771. The next prime is 196799. The reversal of 196781 is 187691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187691 = 7 ⋅26813.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 126025 = 266^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 196781 - 2⁶ = 196717 is a prime.

It is a super-2 number, since 2×196781² = 77445523922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7556 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (52983).

2¹⁹⁶⁷⁸¹ is an apocalyptic number.

It is an amenable number.

196781 is a deficient number, since it is larger than the sum of its proper divisors (15151).

196781 is a wasteful number, since it uses less digits than its factorization.

196781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150.

The product of its digits is 3024, while the sum is 32.

The square root of 196781 is about 443.6000450857. The cubic root of 196781 is about 58.1649091932.

It can be divided in two parts, 1967 and 81, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 196781 in words is "one hundred ninety-six thousand, seven hundred eighty-one".