1982840 has 32 divisors (see below), whose sum is σ = 4698000. Its totient is φ = 751104.

The previous prime is 1982839. The next prime is 1982843. The reversal of 1982840 is 482891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1982797 and 1982806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545 + ... + 2064.

2^1982840 is an apocalyptic number.

1982840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982840 is an abundant number, since it is smaller than the sum of its proper divisors (2715160).

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

1982840 is a wasteful number, since it uses less digits than its factorization.

1982840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639 (or 2635 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1982840 is about 1408.1335163968. The cubic root of 1982840 is about 125.6307320636.

The spelling of 1982840 in words is "one million, nine hundred eighty-two thousand, eight hundred forty".