1138688 has 28 divisors (see below), whose sum is σ = 2293620. Its totient is φ = 565248.

The previous prime is 1138681. The next prime is 1138703. The reversal of 1138688 is 8868311.

It is a happy number.

It is a super-2 number, since 2×1138688² = 2593220722688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8123 + ... + 8261.

It is an arithmetic number, because the mean of its divisors is an integer number (81915).

2^1138688 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 1138688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146810).

1138688 is an abundant number, since it is smaller than the sum of its proper divisors (1154932).

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

1138688 is an frugal number, since it uses more digits than its factorization.

1138688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 141 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1138688 is about 1067.0932480341. The cubic root of 1138688 is about 104.4243020695.

The spelling of 1138688 in words is "one million, one hundred thirty-eight thousand, six hundred eighty-eight".