1985540 has 12 divisors (see below), whose sum is σ = 4169676. Its totient is φ = 794208.

The previous prime is 1985537. The next prime is 1985551. The reversal of 1985540 is 455891.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 1721344 = 514^2 + 1312^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1985497 and 1985506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49619 + ... + 49658.

It is an arithmetic number, because the mean of its divisors is an integer number (347473).

2^1985540 is an apocalyptic number.

1985540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985540 is an abundant number, since it is smaller than the sum of its proper divisors (2184136).

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

1985540 is a wasteful number, since it uses less digits than its factorization.

1985540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99286 (or 99284 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1985540 is about 1409.0919061580. The cubic root of 1985540 is about 125.6877292882.

The spelling of 1985540 in words is "one million, nine hundred eighty-five thousand, five hundred forty".