196619987 has 4 divisors (see below), whose sum is σ = 197618256. Its totient is φ = 195621720.

The previous prime is 196619981. The next prime is 196619989. The reversal of 196619987 is 789916691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789916691 = 211 ⋅3743681.

It is a cyclic number.

It is not a de Polignac number, because 196619987 - 2¹⁰ = 196618963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196619981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498839 + ... + 499232.

It is an arithmetic number, because the mean of its divisors is an integer number (49404564).

Almost surely, 2^196619987 is an apocalyptic number.

196619987 is a deficient number, since it is larger than the sum of its proper divisors (998269).

196619987 is an equidigital number, since it uses as much as digits as its factorization.

196619987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998268.

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

The square root of 196619987 is about 14022.1249102980. The cubic root of 196619987 is about 581.4904068623.

The spelling of 196619987 in words is "one hundred ninety-six million, six hundred nineteen thousand, nine hundred eighty-seven".