9906425 has 12 divisors (see below), whose sum is σ = 12546816. Its totient is φ = 7755600.

The previous prime is 9906401. The next prime is 9906439. The reversal of 9906425 is 5246099.

It is not a de Polignac number, because 9906425 - 2⁶ = 9906361 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 9⁷ + 9⁷ + 0 + 6³ + 4⁹ + 2 + 5⁷ .

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3041 + ... + 5390.

It is an arithmetic number, because the mean of its divisors is an integer number (1045568).

Almost surely, 2^9906425 is an apocalyptic number.

It is an amenable number.

9906425 is a deficient number, since it is larger than the sum of its proper divisors (2640391).

9906425 is a wasteful number, since it uses less digits than its factorization.

9906425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8488 (or 8483 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 9906425 is about 3147.4473784322. The cubic root of 9906425 is about 214.7693578582.

The spelling of 9906425 in words is "nine million, nine hundred six thousand, four hundred twenty-five".