8491939 has 4 divisors (see below), whose sum is σ = 8539560. Its totient is φ = 8444320.

The previous prime is 8491933. The next prime is 8491943. The reversal of 8491939 is 9391948.

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

It is a cyclic number.

It is not a de Polignac number, because 8491939 - 2¹¹ = 8489891 is a prime.

It is a super-2 number, since 2×8491939² = 144226055959442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8491895 and 8491904.

It is not an unprimeable number, because it can be changed into a prime (8491933) 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, 23542 + ... + 23899.

It is an arithmetic number, because the mean of its divisors is an integer number (2134890).

Almost surely, 2^8491939 is an apocalyptic number.

8491939 is a deficient number, since it is larger than the sum of its proper divisors (47621).

8491939 is a wasteful number, since it uses less digits than its factorization.

8491939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47620.

The product of its digits is 69984, while the sum is 43.

The square root of 8491939 is about 2914.0931694097. The cubic root of 8491939 is about 204.0182205307.

Subtracting 8491939 from its reverse (9391948), we obtain a palindrome (900009).

The spelling of 8491939 in words is "eight million, four hundred ninety-one thousand, nine hundred thirty-nine".