1985858 has 16 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 840336.

The previous prime is 1985849. The next prime is 1985873. The reversal of 1985858 is 8585891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308 + ... + 2016.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

2^1985858 is an apocalyptic number.

1985858 is a deficient number, since it is larger than the sum of its proper divisors (1461502).

1985858 is a wasteful number, since it uses less digits than its factorization.

1985858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its digits is 115200, while the sum is 44.

The square root of 1985858 is about 1409.2047402702. The cubic root of 1985858 is about 125.6944388927.

The spelling of 1985858 in words is "one million, nine hundred eighty-five thousand, eight hundred fifty-eight".