1987856 has 40 divisors (see below), whose sum is σ = 4374720. Its totient is φ = 867456.

The previous prime is 1987849. The next prime is 1987873. The reversal of 1987856 is 6587891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3701 + ... + 4203.

It is an arithmetic number, because the mean of its divisors is an integer number (109368).

2^1987856 is an apocalyptic number.

1987856 is a gapful number since it is divisible by the number (16) 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 1987856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2187360).

1987856 is an abundant number, since it is smaller than the sum of its proper divisors (2386864).

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

1987856 is a wasteful number, since it uses less digits than its factorization.

1987856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 537 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The square root of 1987856 is about 1409.9134725223. The cubic root of 1987856 is about 125.7365790846.

It can be divided in two parts, 19 and 87856, that multiplied together give a square (1669264 = 1292²).

The spelling of 1987856 in words is "one million, nine hundred eighty-seven thousand, eight hundred fifty-six".