8691138 has 32 divisors (see below), whose sum is σ = 19561920. Its totient is φ = 2895588.

The previous prime is 8691127. The next prime is 8691157. The reversal of 8691138 is 8311968.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381 + ... + 5367.

It is an arithmetic number, because the mean of its divisors is an integer number (611310).

Almost surely, 2^8691138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8691138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9780960).

8691138 is an abundant number, since it is smaller than the sum of its proper divisors (10870782).

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

8691138 is an equidigital number, since it uses as much as digits as its factorization.

8691138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010 (or 1992 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 8691138 is about 2948.0736083076. The cubic root of 8691138 is about 205.6011543133.

The spelling of 8691138 in words is "eight million, six hundred ninety-one thousand, one hundred thirty-eight".