1985500 has 72 divisors (see below), whose sum is σ = 4992624. Its totient is φ = 684000.

The previous prime is 1985491. The next prime is 1985509. The reversal of 1985500 is 55891.

It is an interprime number because it is at equal distance from previous prime (1985491) and next prime (1985509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104491 + ... + 104509.

It is an arithmetic number, because the mean of its divisors is an integer number (69342).

2^1985500 is an apocalyptic number.

1985500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2496312).

1985500 is an abundant number, since it is smaller than the sum of its proper divisors (3007124).

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

1985500 is a wasteful number, since it uses less digits than its factorization.

1985500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1985500 is about 1409.0777125482. The cubic root of 1985500 is about 125.6868852620.

It can be divided in two parts, 1985 and 500, that added together give a triangular number (2485 = T₇₀).

The spelling of 1985500 in words is "one million, nine hundred eighty-five thousand, five hundred".