9640857 has 4 divisors (see below), whose sum is σ = 12854480. Its totient is φ = 6427236.

The previous prime is 9640849. The next prime is 9640871. The reversal of 9640857 is 7580469.

9640857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9640857 - 2³ = 9640849 is a prime.

It is a super-2 number, since 2×9640857² = 185892247388898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9640817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606807 + ... + 1606812.

It is an arithmetic number, because the mean of its divisors is an integer number (3213620).

Almost surely, 2^9640857 is an apocalyptic number.

It is an amenable number.

9640857 is a deficient number, since it is larger than the sum of its proper divisors (3213623).

9640857 is a wasteful number, since it uses less digits than its factorization.

9640857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213622.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 9640857 is about 3104.9729467420. The cubic root of 9640857 is about 212.8327943433.

The spelling of 9640857 in words is "nine million, six hundred forty thousand, eight hundred fifty-seven".