9947861 has 8 divisors (see below), whose sum is σ = 12402624. Its totient is φ = 7751520.

The previous prime is 9947851. The next prime is 9947863. The reversal of 9947861 is 1687499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9947861 - 2²² = 5753557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64520 + ... + 64673.

It is an arithmetic number, because the mean of its divisors is an integer number (1550328).

Almost surely, 2^9947861 is an apocalyptic number.

It is an amenable number.

9947861 is a deficient number, since it is larger than the sum of its proper divisors (2454763).

9947861 is a wasteful number, since it uses less digits than its factorization.

9947861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129211.

The product of its digits is 108864, while the sum is 44.

The square root of 9947861 is about 3154.0229865998. The cubic root of 9947861 is about 215.0683827909.

The spelling of 9947861 in words is "nine million, nine hundred forty-seven thousand, eight hundred sixty-one".