8909391 has 4 divisors (see below), whose sum is σ = 11879192. Its totient is φ = 5939592.

The previous prime is 8909389. The next prime is 8909393. The reversal of 8909391 is 1939098.

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

It is an interprime number because it is at equal distance from previous prime (8909389) and next prime (8909393).

It is not a de Polignac number, because 8909391 - 2¹ = 8909389 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 (8909393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484896 + ... + 1484901.

It is an arithmetic number, because the mean of its divisors is an integer number (2969798).

Almost surely, 2^8909391 is an apocalyptic number.

8909391 is a deficient number, since it is larger than the sum of its proper divisors (2969801).

8909391 is a wasteful number, since it uses less digits than its factorization.

8909391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969800.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 8909391 is about 2984.8602982384. The cubic root of 8909391 is about 207.3079735068.

The spelling of 8909391 in words is "eight million, nine hundred nine thousand, three hundred ninety-one".