196638687 has 12 divisors (see below), whose sum is σ = 324610000. Its totient is φ = 112364928.

The previous prime is 196638679. The next prime is 196638697. The reversal of 196638687 is 786836691.

It is a happy number.

It is not a de Polignac number, because 196638687 - 2³ = 196638679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196638697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1560562 + ... + 1560687.

Almost surely, 2^196638687 is an apocalyptic number.

196638687 is a deficient number, since it is larger than the sum of its proper divisors (127971313).

196638687 is a wasteful number, since it uses less digits than its factorization.

196638687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121262 (or 3121259 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 196638687 is about 14022.7916978040. The cubic root of 196638687 is about 581.5088409426.

The spelling of 196638687 in words is "one hundred ninety-six million, six hundred thirty-eight thousand, six hundred eighty-seven".