1981012 has 18 divisors (see below), whose sum is σ = 3811514. Its totient is φ = 900240.

The previous prime is 1980991. The next prime is 1981037. The reversal of 1981012 is 2101891.

It can be written as a sum of positive squares in only one way, i.e., 1628176 + 352836 = 1276^2 + 594^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1563 + ... + 2530.

2^1981012 is an apocalyptic number.

It is an amenable number.

1981012 is a deficient number, since it is larger than the sum of its proper divisors (1830502).

1981012 is a wasteful number, since it uses less digits than its factorization.

1981012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119 (or 4106 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1981012 is about 1407.4842805517. The cubic root of 1981012 is about 125.5921134513.

The spelling of 1981012 in words is "one million, nine hundred eighty-one thousand, twelve".