9990725 has 12 divisors (see below), whose sum is σ = 12483204. Its totient is φ = 7931520.

The previous prime is 9990689. The next prime is 9990727. The reversal of 9990725 is 5270999.

It can be written as a sum of positive squares in 6 ways, for example, as 743044 + 9247681 = 862^2 + 3041^2 .

It is not a de Polignac number, because 9990725 - 2⁶ = 9990661 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 (9990727) 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, 1967 + ... + 4883.

It is an arithmetic number, because the mean of its divisors is an integer number (1040267).

Almost surely, 2^9990725 is an apocalyptic number.

It is an amenable number.

9990725 is a deficient number, since it is larger than the sum of its proper divisors (2492479).

9990725 is a wasteful number, since it uses less digits than its factorization.

9990725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064 (or 3059 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 9990725 is about 3160.8108136995. The cubic root of 9990725 is about 215.3768404604.

The spelling of 9990725 in words is "nine million, nine hundred ninety thousand, seven hundred twenty-five".