9947858 has 4 divisors (see below), whose sum is σ = 14921790. Its totient is φ = 4973928.

The previous prime is 9947851. The next prime is 9947863. The reversal of 9947858 is 8587499.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5508409 + 4439449 = 2347^2 + 2107^2 .

It is not an unprimeable number, because it can be changed into a prime (9947851) 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 as a sum of consecutive naturals, namely, 2486963 + ... + 2486966.

Almost surely, 2^9947858 is an apocalyptic number.

9947858 is a deficient number, since it is larger than the sum of its proper divisors (4973932).

9947858 is a wasteful number, since it uses less digits than its factorization.

9947858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973931.

The product of its digits is 725760, while the sum is 50.

The square root of 9947858 is about 3154.0225110167. The cubic root of 9947858 is about 215.0683611713.

The spelling of 9947858 in words is "nine million, nine hundred forty-seven thousand, eight hundred fifty-eight".