9891963 has 20 divisors (see below), whose sum is σ = 14941080. Its totient is φ = 6521472.

The previous prime is 9891953. The next prime is 9891991. The reversal of 9891963 is 3691989.

It is not a de Polignac number, because 9891963 - 2⁶ = 9891899 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9891923) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7228 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (747054).

Almost surely, 2^9891963 is an apocalyptic number.

9891963 is a deficient number, since it is larger than the sum of its proper divisors (5049117).

9891963 is a wasteful number, since it uses less digits than its factorization.

9891963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1359 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 9891963 is about 3145.1491220608. The cubic root of 9891963 is about 214.6647958485.

The spelling of 9891963 in words is "nine million, eight hundred ninety-one thousand, nine hundred sixty-three".