9947691 has 48 divisors (see below), whose sum is σ = 16633344. Its totient is φ = 5901984.

The previous prime is 9947671. The next prime is 9947719. The reversal of 9947691 is 1967499.

9947691 is a `hidden beast` number, since 99 + 476 + 91 = 666.

It is not a de Polignac number, because 9947691 - 2⁶ = 9947627 is a prime.

9947691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9947611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148440 + ... + 148506.

It is an arithmetic number, because the mean of its divisors is an integer number (346528).

Almost surely, 2^9947691 is an apocalyptic number.

9947691 is a deficient number, since it is larger than the sum of its proper divisors (6685653).

9947691 is a wasteful number, since it uses less digits than its factorization.

9947691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 130 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 9947691 is about 3153.9960367762. The cubic root of 9947691 is about 215.0671576755.

The spelling of 9947691 in words is "nine million, nine hundred forty-seven thousand, six hundred ninety-one".