9981142 has 16 divisors (see below), whose sum is σ = 15958512. Its totient is φ = 4665600.

The previous prime is 9981121. The next prime is 9981143. The reversal of 9981142 is 2411899.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 9981098 and 9981107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4642 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (997407).

Almost surely, 2^9981142 is an apocalyptic number.

9981142 is a deficient number, since it is larger than the sum of its proper divisors (5977370).

9981142 is a wasteful number, since it uses less digits than its factorization.

9981142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983.

The product of its digits is 5184, while the sum is 34.

The square root of 9981142 is about 3159.2945415076. The cubic root of 9981142 is about 215.3079560194.

The spelling of 9981142 in words is "nine million, nine hundred eighty-one thousand, one hundred forty-two".