9981937 has 6 divisors (see below), whose sum is σ = 11611698. Its totient is φ = 8555904.

The previous prime is 9981929. The next prime is 9981943. The reversal of 9981937 is 7391899.

It can be written as a sum of positive squares in only one way, i.e., 8156736 + 1825201 = 2856^2 + 1351^2 .

It is not a de Polignac number, because 9981937 - 2³ = 9981929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9981637) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 101808 + ... + 101905.

It is an arithmetic number, because the mean of its divisors is an integer number (1935283).

Almost surely, 2^9981937 is an apocalyptic number.

It is an amenable number.

9981937 is a deficient number, since it is larger than the sum of its proper divisors (1629761).

9981937 is a wasteful number, since it uses less digits than its factorization.

9981937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203727 (or 203720 counting only the distinct ones).

The product of its digits is 122472, while the sum is 46.

The square root of 9981937 is about 3159.4203582303. The cubic root of 9981937 is about 215.3136723085.

It can be divided in two parts, 99819 and 37, that added together give a square (99856 = 316²).

The spelling of 9981937 in words is "nine million, nine hundred eighty-one thousand, nine hundred thirty-seven".