8890391 has 4 divisors (see below), whose sum is σ = 8907192. Its totient is φ = 8873592.

The previous prime is 8890373. The next prime is 8890403. The reversal of 8890391 is 1930988.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8890391 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 (8890361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7580 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (2226798).

Almost surely, 2^8890391 is an apocalyptic number.

8890391 is a deficient number, since it is larger than the sum of its proper divisors (16801).

8890391 is a wasteful number, since it uses less digits than its factorization.

8890391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16800.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 8890391 is about 2981.6758710497. The cubic root of 8890391 is about 207.1605015942.

The spelling of 8890391 in words is "eight million, eight hundred ninety thousand, three hundred ninety-one".