1981035 has 48 divisors (see below), whose sum is σ = 4143360. Its totient is φ = 855360.

The previous prime is 1980991. The next prime is 1981037. The reversal of 1981035 is 5301891.

It is not a de Polignac number, because 1981035 - 2⁷ = 1980907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1981037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5820 + ... + 6150.

It is an arithmetic number, because the mean of its divisors is an integer number (86320).

2^1981035 is an apocalyptic number.

1981035 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981035 is an abundant number, since it is smaller than the sum of its proper divisors (2162325).

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

1981035 is a wasteful number, since it uses less digits than its factorization.

1981035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1981035 is about 1407.4924511343. The cubic root of 1981035 is about 125.5925995004.

The spelling of 1981035 in words is "one million, nine hundred eighty-one thousand, thirty-five".