196640 has 24 divisors (see below), whose sum is σ = 464940. Its totient is φ = 78592.

The previous prime is 196613. The next prime is 196643. The reversal of 196640 is 46691.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 13456 = 428^2 + 116^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (196643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455 + ... + 774.

2¹⁹⁶⁶⁴⁰ is an apocalyptic number.

196640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

196640 is an abundant number, since it is smaller than the sum of its proper divisors (268300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

196640 is a wasteful number, since it uses less digits than its factorization.

196640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 196640 is about 443.4410896613. The cubic root of 196640 is about 58.1510135227.

The spelling of 196640 in words is "one hundred ninety-six thousand, six hundred forty".