1985556 has 12 divisors (see below), whose sum is σ = 4632992. Its totient is φ = 661848.

The previous prime is 1985551. The next prime is 1985561. The reversal of 1985556 is 6555891.

It is an interprime number because it is at equal distance from previous prime (1985551) and next prime (1985561).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82720 + ... + 82743.

2^1985556 is an apocalyptic number.

It is an amenable number.

1985556 is an abundant number, since it is smaller than the sum of its proper divisors (2647436).

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

1985556 is a wasteful number, since it uses less digits than its factorization.

1985556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165470 (or 165468 counting only the distinct ones).

The product of its digits is 54000, while the sum is 39.

The square root of 1985556 is about 1409.0975835619. The cubic root of 1985556 is about 125.6880668955.

The spelling of 1985556 in words is "one million, nine hundred eighty-five thousand, five hundred fifty-six".