1981170 has 24 divisors (see below), whose sum is σ = 5151276. Its totient is φ = 528288.

The previous prime is 1981169. The next prime is 1981181. The reversal of 1981170 is 711891.

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 1521 = 1407^2 + 39^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10917 + ... + 11096.

2^1981170 is an apocalyptic number.

1981170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981170 is an abundant number, since it is smaller than the sum of its proper divisors (3170106).

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

1981170 is a wasteful number, since it uses less digits than its factorization.

1981170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22026 (or 22023 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1981170 is about 1407.5404079457. The cubic root of 1981170 is about 125.5954523216.

It can be divided in two parts, 19811 and 70, that added together give a square (19881 = 141²).

The spelling of 1981170 in words is "one million, nine hundred eighty-one thousand, one hundred seventy".