7909641 has 18 divisors (see below), whose sum is σ = 12140622. Its totient is φ = 4961280.

The previous prime is 7909639. The next prime is 7909673. The reversal of 7909641 is 1469097.

7909641 is a `hidden beast` number, since 7 + 9 + 0 + 9 + 641 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 5659641 + 2250000 = 2379^2 + 1500^2 .

It is not a de Polignac number, because 7909641 - 2¹ = 7909639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7909596 and 7909605.

It is not an unprimeable number, because it can be changed into a prime (7909691) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1081 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (674479).

Almost surely, 2^7909641 is an apocalyptic number.

It is an amenable number.

7909641 is a deficient number, since it is larger than the sum of its proper divisors (4230981).

7909641 is a wasteful number, since it uses less digits than its factorization.

7909641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081 (or 3061 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 7909641 is about 2812.4083985083. The cubic root of 7909641 is about 199.2441554267.

The spelling of 7909641 in words is "seven million, nine hundred nine thousand, six hundred forty-one".