1158840 has 128 divisors (see below), whose sum is σ = 4104000. Its totient is φ = 290304.

The previous prime is 1158827. The next prime is 1158841. The reversal of 1158840 is 488511.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31302 + ... + 31338.

2^1158840 is an apocalyptic number.

1158840 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 1158840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052000).

1158840 is an abundant number, since it is smaller than the sum of its proper divisors (2945160).

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

1158840 is a wasteful number, since it uses less digits than its factorization.

1158840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1158840 is about 1076.4943102497. The cubic root of 1158840 is about 105.0367218496.

It can be divided in two parts, 11588 and 40, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 1158840 in words is "one million, one hundred fifty-eight thousand, eight hundred forty".