1985823 has 48 divisors (see below), whose sum is σ = 3648000. Its totient is φ = 1061424.

The previous prime is 1985803. The next prime is 1985849. The reversal of 1985823 is 3285891.

It is not a de Polignac number, because 1985823 - 2⁵ = 1985791 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (17280) is a multiple of the sum of its prime divisors (108).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985803) 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 47 ways as a sum of consecutive naturals, for example, 25098 + ... + 25176.

It is an arithmetic number, because the mean of its divisors is an integer number (76000).

2^1985823 is an apocalyptic number.

1985823 is a deficient number, since it is larger than the sum of its proper divisors (1662177).

1985823 is a wasteful number, since it uses less digits than its factorization.

1985823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 108 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1985823 is about 1409.1923218638. The cubic root of 1985823 is about 125.6937004493.

It can be divided in two parts, 19858 and 23, that added together give a square (19881 = 141²).

The spelling of 1985823 in words is "one million, nine hundred eighty-five thousand, eight hundred twenty-three".