1985564 has 12 divisors (see below), whose sum is σ = 3971184. Its totient is φ = 850944.

The previous prime is 1985561. The next prime is 1985573. The reversal of 1985564 is 4655891.

1985564 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985561) 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, 35429 + ... + 35484.

It is an arithmetic number, because the mean of its divisors is an integer number (330932).

2^1985564 is an apocalyptic number.

1985564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1985564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1985564 is a wasteful number, since it uses less digits than its factorization.

1985564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70924 (or 70922 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 1985564 is about 1409.1004222553. The cubic root of 1985564 is about 125.6882356984.

The spelling of 1985564 in words is "one million, nine hundred eighty-five thousand, five hundred sixty-four".