196917986 has 4 divisors (see below), whose sum is σ = 295376982. Its totient is φ = 98458992.

The previous prime is 196917979. The next prime is 196918009. The reversal of 196917986 is 689719691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689719691 = 79 ⋅8730629.

It can be written as a sum of positive squares in only one way, i.e., 139688761 + 57229225 = 11819^2 + 7565^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 49229495 + ... + 49229498.

Almost surely, 2^196917986 is an apocalyptic number.

196917986 is a deficient number, since it is larger than the sum of its proper divisors (98458996).

196917986 is an equidigital number, since it uses as much as digits as its factorization.

196917986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98458995.

The product of its digits is 1469664, while the sum is 56.

The square root of 196917986 is about 14032.7469156969. The cubic root of 196917986 is about 581.7840292497.

The spelling of 196917986 in words is "one hundred ninety-six million, nine hundred seventeen thousand, nine hundred eighty-six".