7988191 has 8 divisors (see below), whose sum is σ = 8139600. Its totient is φ = 7838400.

The previous prime is 7988177. The next prime is 7988203. The reversal of 7988191 is 1918897.

7988191 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 7988191 - 2⁷ = 7988063 is a prime.

It is a super-2 number, since 2×7988191² = 127622390904962, which contains 22 as substring.

It is a Duffinian number.

7988191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13755 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (1017450).

Almost surely, 2^7988191 is an apocalyptic number.

7988191 is a deficient number, since it is larger than the sum of its proper divisors (151409).

7988191 is a wasteful number, since it uses less digits than its factorization.

7988191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809.

The product of its digits is 36288, while the sum is 43.

The square root of 7988191 is about 2826.3387978089. The cubic root of 7988191 is about 199.9015432059.

The spelling of 7988191 in words is "seven million, nine hundred eighty-eight thousand, one hundred ninety-one".