1981732 has 6 divisors (see below), whose sum is σ = 3468038. Its totient is φ = 990864.

The previous prime is 1981711. The next prime is 1981739. The reversal of 1981732 is 2371891.

It can be written as a sum of positive squares in only one way, i.e., 1048576 + 933156 = 1024^2 + 966^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1981694 and 1981703.

It is not an unprimeable number, because it can be changed into a prime (1981739) by changing a digit.

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 as a sum of consecutive naturals, namely, 247713 + ... + 247720.

2^1981732 is an apocalyptic number.

It is an amenable number.

1981732 is a deficient number, since it is larger than the sum of its proper divisors (1486306).

1981732 is a wasteful number, since it uses less digits than its factorization.

1981732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495437 (or 495435 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1981732 is about 1407.7400328186. The cubic root of 1981732 is about 125.6073271180.

The spelling of 1981732 in words is "one million, nine hundred eighty-one thousand, seven hundred thirty-two".