196443639 has 12 divisors (see below), whose sum is σ = 324288016. Its totient is φ = 112253472.

The previous prime is 196443631. The next prime is 196443661. The reversal of 196443639 is 936344691.

196443639 is a `hidden beast` number, since 1 + 9 + 6 + 4 + 4 + 3 + 639 = 666.

It is not a de Polignac number, because 196443639 - 2³ = 196443631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 196443594 and 196443603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196443631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1559014 + ... + 1559139.

Almost surely, 2^196443639 is an apocalyptic number.

196443639 is a deficient number, since it is larger than the sum of its proper divisors (127844377).

196443639 is a wasteful number, since it uses less digits than its factorization.

196443639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118166 (or 3118163 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 196443639 is about 14015.8352944090. The cubic root of 196443639 is about 581.3165090735.

The spelling of 196443639 in words is "one hundred ninety-six million, four hundred forty-three thousand, six hundred thirty-nine".