1985859 has 12 divisors (see below), whose sum is σ = 2883816. Its totient is φ = 1316832.

The previous prime is 1985849. The next prime is 1985873. The reversal of 1985859 is 9585891.

It is not a de Polignac number, because 1985859 - 2¹³ = 1977667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985849) 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 11 ways as a sum of consecutive naturals, for example, 1624 + ... + 2570.

It is an arithmetic number, because the mean of its divisors is an integer number (240318).

2^1985859 is an apocalyptic number.

1985859 is a deficient number, since it is larger than the sum of its proper divisors (897957).

1985859 is a wasteful number, since it uses less digits than its factorization.

1985859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1183 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1985859 is about 1409.2050950802. The cubic root of 1985859 is about 125.6944599909.

The spelling of 1985859 in words is "one million, nine hundred eighty-five thousand, eight hundred fifty-nine".