7940891 has 6 divisors (see below), whose sum is σ = 9237420. Its totient is φ = 6806436.

The previous prime is 7940857. The next prime is 7940893. The reversal of 7940891 is 1980497.

It is a de Polignac number, because none of the positive numbers 2^k-7940891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7940893) 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 5 ways as a sum of consecutive naturals, for example, 80981 + ... + 81078.

It is an arithmetic number, because the mean of its divisors is an integer number (1539570).

Almost surely, 2^7940891 is an apocalyptic number.

7940891 is a deficient number, since it is larger than the sum of its proper divisors (1296529).

7940891 is a wasteful number, since it uses less digits than its factorization.

7940891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162073 (or 162066 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7940891 is about 2817.9586583199. The cubic root of 7940891 is about 199.5062068450.

The spelling of 7940891 in words is "seven million, nine hundred forty thousand, eight hundred ninety-one".