9971845 has 12 divisors (see below), whose sum is σ = 12958596. Its totient is φ = 7363200.

The previous prime is 9971839. The next prime is 9971861. The reversal of 9971845 is 5481799.

It can be written as a sum of positive squares in 6 ways, for example, as 1855044 + 8116801 = 1362^2 + 2849^2 .

It is not a de Polignac number, because 9971845 - 2³ = 9971837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5056 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (1079883).

Almost surely, 2^9971845 is an apocalyptic number.

It is an amenable number.

9971845 is a deficient number, since it is larger than the sum of its proper divisors (2986751).

9971845 is a wasteful number, since it uses less digits than its factorization.

9971845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11832 (or 11819 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 9971845 is about 3157.8228259356. The cubic root of 9971845 is about 215.2410852514.

It can be divided in two parts, 9971 and 845, that added together give a square (10816 = 104²).

The spelling of 9971845 in words is "nine million, nine hundred seventy-one thousand, eight hundred forty-five".