9891825 has 12 divisors (see below), whose sum is σ = 16354608. Its totient is φ = 5275600.

The previous prime is 9891823. The next prime is 9891851. The reversal of 9891825 is 5281989.

It is a happy number.

It is not a de Polignac number, because 9891825 - 2¹ = 9891823 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9891823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65871 + ... + 66020.

It is an arithmetic number, because the mean of its divisors is an integer number (1362884).

Almost surely, 2^9891825 is an apocalyptic number.

It is an amenable number.

9891825 is a deficient number, since it is larger than the sum of its proper divisors (6462783).

9891825 is a wasteful number, since it uses less digits than its factorization.

9891825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131904 (or 131899 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 9891825 is about 3145.1271834379. The cubic root of 9891825 is about 214.6637976011.

The spelling of 9891825 in words is "nine million, eight hundred ninety-one thousand, eight hundred twenty-five".