7884991 has 4 divisors (see below), whose sum is σ = 8348832. Its totient is φ = 7421152.

The previous prime is 7884983. The next prime is 7885051. The reversal of 7884991 is 1994887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1994887 = 71 ⋅28097.

It is a cyclic number.

It is not a de Polignac number, because 7884991 - 2³ = 7884983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7884901) 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 3 ways as a sum of consecutive naturals, for example, 231895 + ... + 231928.

It is an arithmetic number, because the mean of its divisors is an integer number (2087208).

Almost surely, 2^7884991 is an apocalyptic number.

7884991 is a deficient number, since it is larger than the sum of its proper divisors (463841).

7884991 is a wasteful number, since it uses less digits than its factorization.

7884991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463840.

The product of its digits is 145152, while the sum is 46.

The square root of 7884991 is about 2808.0226138691. The cubic root of 7884991 is about 199.0369618978.

The spelling of 7884991 in words is "seven million, eight hundred eighty-four thousand, nine hundred ninety-one".