9781142 has 8 divisors (see below), whose sum is σ = 16767696. Its totient is φ = 4191912.

The previous prime is 9781139. The next prime is 9781153. The reversal of 9781142 is 2411879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9781099 and 9781108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349313 + ... + 349340.

It is an arithmetic number, because the mean of its divisors is an integer number (2095962).

Almost surely, 2^9781142 is an apocalyptic number.

9781142 is a deficient number, since it is larger than the sum of its proper divisors (6986554).

9781142 is a wasteful number, since it uses less digits than its factorization.

9781142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698662.

The product of its digits is 4032, while the sum is 32.

The square root of 9781142 is about 3127.4817345590. The cubic root of 9781142 is about 213.8601438654.

The spelling of 9781142 in words is "nine million, seven hundred eighty-one thousand, one hundred forty-two".