1984780 has 24 divisors (see below), whose sum is σ = 4763808. Its totient is φ = 680448.

The previous prime is 1984777. The next prime is 1984783. The reversal of 1984780 is 874891.

It is an interprime number because it is at equal distance from previous prime (1984777) and next prime (1984783).

It is not an unprimeable number, because it can be changed into a prime (1984783) 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, 6949 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (198492).

2^1984780 is an apocalyptic number.

1984780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1984780 is an abundant number, since it is smaller than the sum of its proper divisors (2779028).

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

1984780 is a wasteful number, since it uses less digits than its factorization.

1984780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14193 (or 14191 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1984780 is about 1408.8222031186. The cubic root of 1984780 is about 125.6716908529.

The spelling of 1984780 in words is "one million, nine hundred eighty-four thousand, seven hundred eighty".