9781042 has 16 divisors (see below), whose sum is σ = 15191064. Its totient is φ = 4720000.

The previous prime is 9781039. The next prime is 9781043. The reversal of 9781042 is 2401879.

It can be written as a sum of positive squares in 4 ways, for example, as 9603801 + 177241 = 3099^2 + 421^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9780995 and 9781013.

It is not an unprimeable number, because it can be changed into a prime (9781043) 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 7 ways as a sum of consecutive naturals, for example, 7692 + ... + 8872.

Almost surely, 2^9781042 is an apocalyptic number.

9781042 is a deficient number, since it is larger than the sum of its proper divisors (5410022).

9781042 is a wasteful number, since it uses less digits than its factorization.

9781042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 9781042 is about 3127.4657472145. The cubic root of 9781042 is about 213.8594150450.

The spelling of 9781042 in words is "nine million, seven hundred eighty-one thousand, forty-two".