8391136 has 48 divisors (see below), whose sum is σ = 18585504. Its totient is φ = 3700224.

The previous prime is 8391127. The next prime is 8391137. The reversal of 8391136 is 6311938.

It is a super-2 number, since 2×8391136² = 140822326740992, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8391098 and 8391107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9130 + ... + 10006.

It is an arithmetic number, because the mean of its divisors is an integer number (387198).

Almost surely, 2^8391136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8391136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9292752).

8391136 is an abundant number, since it is smaller than the sum of its proper divisors (10194368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8391136 is a wasteful number, since it uses less digits than its factorization.

8391136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 915 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 8391136 is about 2896.7457603318. The cubic root of 8391136 is about 203.2077435204.

It can be divided in two parts, 83 and 91136, that added together give a palindrome (91219).

The spelling of 8391136 in words is "eight million, three hundred ninety-one thousand, one hundred thirty-six".