8897991 has 8 divisors (see below), whose sum is σ = 11880960. Its totient is φ = 5923512.

The previous prime is 8897989. The next prime is 8898017. The reversal of 8897991 is 1997988.

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

It is not a de Polignac number, because 8897991 - 2¹ = 8897989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8897921) 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 7 ways as a sum of consecutive naturals, for example, 970 + ... + 4328.

It is an arithmetic number, because the mean of its divisors is an integer number (1485120).

Almost surely, 2^8897991 is an apocalyptic number.

8897991 is a deficient number, since it is larger than the sum of its proper divisors (2982969).

8897991 is a wasteful number, since it uses less digits than its factorization.

8897991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245.

The product of its digits is 326592, while the sum is 51.

The square root of 8897991 is about 2982.9500498667. The cubic root of 8897991 is about 207.2195155488.

The spelling of 8897991 in words is "eight million, eight hundred ninety-seven thousand, nine hundred ninety-one".