8888991 has 16 divisors (see below), whose sum is σ = 12350304. Its totient is φ = 5681664.

The previous prime is 8888989. The next prime is 8889007. The reversal of 8888991 is 1998888.

It is not a de Polignac number, because 8888991 - 2¹ = 8888989 is a prime.

8888991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8888951) 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 15 ways as a sum of consecutive naturals, for example, 7555 + ... + 8651.

It is an arithmetic number, because the mean of its divisors is an integer number (771894).

Almost surely, 2^8888991 is an apocalyptic number.

8888991 is a deficient number, since it is larger than the sum of its proper divisors (3461313).

8888991 is a wasteful number, since it uses less digits than its factorization.

8888991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210.

The product of its digits is 331776, while the sum is 51.

The square root of 8888991 is about 2981.4410945045. The cubic root of 8888991 is about 207.1496269346.

The spelling of 8888991 in words is "eight million, eight hundred eighty-eight thousand, nine hundred ninety-one".