1982780 has 12 divisors (see below), whose sum is σ = 4163880. Its totient is φ = 793104.

The previous prime is 1982779. The next prime is 1982797. The reversal of 1982780 is 872891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1982780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49550 + ... + 49589.

It is an arithmetic number, because the mean of its divisors is an integer number (346990).

2^1982780 is an apocalyptic number.

1982780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982780 is an abundant number, since it is smaller than the sum of its proper divisors (2181100).

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

1982780 is a wasteful number, since it uses less digits than its factorization.

1982780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99148 (or 99146 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1982780 is about 1408.1122114377. The cubic root of 1982780 is about 125.6294648711.

The spelling of 1982780 in words is "one million, nine hundred eighty-two thousand, seven hundred eighty".