1963946689 has 12 divisors (see below), whose sum is σ = 2041246548. Its totient is φ = 1889447520.

The previous prime is 1963946687. The next prime is 1963946711. The reversal of 1963946689 is 9866493691.

It can be written as a sum of positive squares in 2 ways, for example, as 1338096400 + 625850289 = 36580^2 + 25017^2 .

It is not a de Polignac number, because 1963946689 - 2¹ = 1963946687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1963946687) 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, 160347 + ... + 172159.

It is an arithmetic number, because the mean of its divisors is an integer number (170103879).

Almost surely, 2^1963946689 is an apocalyptic number.

It is an amenable number.

1963946689 is a deficient number, since it is larger than the sum of its proper divisors (77299859).

1963946689 is a wasteful number, since it uses less digits than its factorization.

1963946689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12048 (or 12017 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 61.

The square root of 1963946689 is about 44316.4381353014. The cubic root of 1963946689 is about 1252.3043762563.

The spelling of 1963946689 in words is "one billion, nine hundred sixty-three million, nine hundred forty-six thousand, six hundred eighty-nine".