1981674 has 24 divisors (see below), whose sum is σ = 4345380. Its totient is φ = 652608.

The previous prime is 1981669. The next prime is 1981687. The reversal of 1981674 is 4761891.

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 2025 = 1407^2 + 45^2 .

It is a congruent number.

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, 984 + ... + 2220.

2^1981674 is an apocalyptic number.

1981674 is an abundant number, since it is smaller than the sum of its proper divisors (2363706).

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

1981674 is a wasteful number, since it uses less digits than its factorization.

1981674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1331 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1981674 is about 1407.7194322733. The cubic root of 1981674 is about 125.6061017091.

The spelling of 1981674 in words is "one million, nine hundred eighty-one thousand, six hundred seventy-four".