1131840 has 112 divisors (see below), whose sum is σ = 4023360. Its totient is φ = 299520.

The previous prime is 1131839. The next prime is 1131857. The reversal of 1131840 is 481311.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 8575 + ... + 8705.

2^1131840 is an apocalyptic number.

1131840 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 1131840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011680).

1131840 is an abundant number, since it is smaller than the sum of its proper divisors (2891520).

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

1131840 is a wasteful number, since it uses less digits than its factorization.

1131840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1131840 is about 1063.8796924465. The cubic root of 1131840 is about 104.2145472326.

It can be divided in two parts, 113 and 1840, that added together give a triangular number (1953 = T₆₂).

The spelling of 1131840 in words is "one million, one hundred thirty-one thousand, eight hundred forty".