1981056 has 128 divisors (see below), whose sum is σ = 6658560. Its totient is φ = 506880.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981056 is 6501891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

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, 29535 + ... + 29601.

It is an arithmetic number, because the mean of its divisors is an integer number (52020).

2^1981056 is an apocalyptic number.

1981056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is a pronic number, being equal to 1407×1408.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3329280).

1981056 is an abundant number, since it is smaller than the sum of its proper divisors (4677504).

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

1981056 is a wasteful number, since it uses less digits than its factorization.

1981056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1981056 is about 1407.4999111901. The cubic root of 1981056 is about 125.5930432811.

The spelling of 1981056 in words is "one million, nine hundred eighty-one thousand, fifty-six".