196861939 has 2 divisors, whose sum is σ = 196861940. Its totient is φ = 196861938.

The previous prime is 196861901. The next prime is 196861963. The reversal of 196861939 is 939168691.

It is a strong prime.

It is an emirp because it is prime and its reverse (939168691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196861939 is a prime.

It is not a weakly prime, because it can be changed into another prime (196861969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98430969 + 98430970.

It is an arithmetic number, because the mean of its divisors is an integer number (98430970).

Almost surely, 2^196861939 is an apocalyptic number.

196861939 is a deficient number, since it is larger than the sum of its proper divisors (1).

196861939 is an equidigital number, since it uses as much as digits as its factorization.

196861939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 196861939 is about 14030.7497661387. The cubic root of 196861939 is about 581.7288280224.

The spelling of 196861939 in words is "one hundred ninety-six million, eight hundred sixty-one thousand, nine hundred thirty-nine".