1121688 has 48 divisors (see below), whose sum is σ = 3155880. Its totient is φ = 373248.

The previous prime is 1121671. The next prime is 1121689. The reversal of 1121688 is 8861211.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1656 + ... + 2232.

2^1121688 is an apocalyptic number.

1121688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577940).

1121688 is an abundant number, since it is smaller than the sum of its proper divisors (2034192).

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

1121688 is an equidigital number, since it uses as much as digits as its factorization.

1121688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598 (or 582 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1121688 is about 1059.0977292016. The cubic root of 1121688 is about 103.9020280513.

Adding to 1121688 its reverse (8861211), we get a palindrome (9982899).

The spelling of 1121688 in words is "one million, one hundred twenty-one thousand, six hundred eighty-eight".