1121640 has 64 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 275712.

The previous prime is 1121629. The next prime is 1121651. The reversal of 1121640 is 461211.

It is an interprime number because it is at equal distance from previous prime (1121629) and next prime (1121651).

It is a super-3 number, since 3×1121640³ = 4233326068400832000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 1201 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2^1121640 is an apocalyptic number.

1121640 is a gapful number since it is divisible by the number (10) 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 1121640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

1121640 is an abundant number, since it is smaller than the sum of its proper divisors (2507160).

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

1121640 is a wasteful number, since it uses less digits than its factorization.

1121640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1121640 is about 1059.0750681609. The cubic root of 1121640 is about 103.9005459491.

Adding to 1121640 its reverse (461211), we get a palindrome (1582851).

The spelling of 1121640 in words is "one million, one hundred twenty-one thousand, six hundred forty".