196423987 has 4 divisors (see below), whose sum is σ = 198331120. Its totient is φ = 194516856.

The previous prime is 196423963. The next prime is 196424017. The reversal of 196423987 is 789324691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789324691 = 73 ⋅10812667.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196423987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 196423987.

It is not an unprimeable number, because it can be changed into a prime (196423937) 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, 953412 + ... + 953617.

It is an arithmetic number, because the mean of its divisors is an integer number (49582780).

Almost surely, 2^196423987 is an apocalyptic number.

196423987 is a deficient number, since it is larger than the sum of its proper divisors (1907133).

196423987 is a wasteful number, since it uses less digits than its factorization.

196423987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907132.

The product of its digits is 653184, while the sum is 49.

The square root of 196423987 is about 14015.1342127002. The cubic root of 196423987 is about 581.2971236778.

The spelling of 196423987 in words is "one hundred ninety-six million, four hundred twenty-three thousand, nine hundred eighty-seven".