9781040 has 20 divisors (see below), whose sum is σ = 22741104. Its totient is φ = 3912384.

The previous prime is 9781039. The next prime is 9781043. The reversal of 9781040 is 401879.

9781040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9780994 and 9781012.

It is not an unprimeable number, because it can be changed into a prime (9781043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61052 + ... + 61211.

Almost surely, 2^9781040 is an apocalyptic number.

It is an amenable number.

9781040 is an abundant number, since it is smaller than the sum of its proper divisors (12960064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9781040 is a wasteful number, since it uses less digits than its factorization.

9781040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122276 (or 122270 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 9781040 is about 3127.4654274668. The cubic root of 9781040 is about 213.8594004686.

The spelling of 9781040 in words is "nine million, seven hundred eighty-one thousand, forty".