1985720 has 32 divisors (see below), whose sum is σ = 4875120. Its totient is φ = 721920.

The previous prime is 1985713. The next prime is 1985729. The reversal of 1985720 is 275891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985729) 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 7 ways as a sum of consecutive naturals, for example, 1817 + ... + 2696.

2^1985720 is an apocalyptic number.

1985720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985720 is an abundant number, since it is smaller than the sum of its proper divisors (2889400).

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

1985720 is a wasteful number, since it uses less digits than its factorization.

1985720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535 (or 4531 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1985720 is about 1409.1557756331. The cubic root of 1985720 is about 125.6915272655.

The spelling of 1985720 in words is "one million, nine hundred eighty-five thousand, seven hundred twenty".