1087840 has 48 divisors (see below), whose sum is σ = 2773008. Its totient is φ = 400896.

The previous prime is 1087829. The next prime is 1087841. The reversal of 1087840 is 487801.

1087840 = 96² + 97² + ... + 160².

It is a junction number, because it is equal to n+sod(n) for n = 1087799 and 1087808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1819 + ... + 2341.

It is an arithmetic number, because the mean of its divisors is an integer number (57771).

2^1087840 is an apocalyptic number.

1087840 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 1087840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386504).

1087840 is an abundant number, since it is smaller than the sum of its proper divisors (1685168).

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

1087840 is a wasteful number, since it uses less digits than its factorization.

1087840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1087840 is about 1042.9956855136. The cubic root of 1087840 is about 102.8462216506.

The spelling of 1087840 in words is "one million, eighty-seven thousand, eight hundred forty".