196978861 has 16 divisors (see below), whose sum is σ = 206926720. Its totient is φ = 187323840.

The previous prime is 196978853. The next prime is 196978907. The reversal of 196978861 is 168879691.

It is a cyclic number.

It is not a de Polignac number, because 196978861 - 2³ = 196978853 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 (196978811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448480 + ... + 448918.

It is an arithmetic number, because the mean of its divisors is an integer number (12932920).

Almost surely, 2^196978861 is an apocalyptic number.

It is an amenable number.

196978861 is a deficient number, since it is larger than the sum of its proper divisors (9947859).

196978861 is a wasteful number, since it uses less digits than its factorization.

196978861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 1306368, while the sum is 55.

The square root of 196978861 is about 14034.9157817210. The cubic root of 196978861 is about 581.8439737553.

The spelling of 196978861 in words is "one hundred ninety-six million, nine hundred seventy-eight thousand, eight hundred sixty-one".