1983840 has 48 divisors (see below), whose sum is σ = 6250608. Its totient is φ = 528896.

The previous prime is 1983833. The next prime is 1983851. The reversal of 1983840 is 483891.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1983840² = 7871242291200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (130221).

2^1983840 is an apocalyptic number.

1983840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1983840 is an abundant number, since it is smaller than the sum of its proper divisors (4266768).

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

1983840 is a wasteful number, since it uses less digits than its factorization.

1983840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151 (or 4143 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1983840 is about 1408.4885516042. The cubic root of 1983840 is about 125.6518481762.

The spelling of 1983840 in words is "one million, nine hundred eighty-three thousand, eight hundred forty".