1661982 has 24 divisors (see below), whose sum is σ = 3867336. Its totient is φ = 474768.

The previous prime is 1661977. The next prime is 1661983. The reversal of 1661982 is 2891661.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661983) 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 in 11 ways as a sum of consecutive naturals, for example, 2533 + ... + 3120.

It is an arithmetic number, because the mean of its divisors is an integer number (161139).

2^1661982 is an apocalyptic number.

1661982 is an abundant number, since it is smaller than the sum of its proper divisors (2205354).

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

1661982 is a wasteful number, since it uses less digits than its factorization.

1661982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672 (or 5665 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1661982 is about 1289.1788083893. The cubic root of 1661982 is about 118.4519201769.

The spelling of 1661982 in words is "one million, six hundred sixty-one thousand, nine hundred eighty-two".