1985236540 has 48 divisors (see below), whose sum is σ = 5044842432. Its totient is φ = 640613376.

The previous prime is 1985236493. The next prime is 1985236573. The reversal of 1985236540 is 456325891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414687 + ... + 419446.

It is an arithmetic number, because the mean of its divisors is an integer number (105100884).

Almost surely, 2^1985236540 is an apocalyptic number.

1985236540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985236540 is an abundant number, since it is smaller than the sum of its proper divisors (3059605892).

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

1985236540 is a wasteful number, since it uses less digits than its factorization.

1985236540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834166 (or 834164 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 1985236540 is about 44555.9933117869. The cubic root of 1985236540 is about 1256.8132580070.

The spelling of 1985236540 in words is "one billion, nine hundred eighty-five million, two hundred thirty-six thousand, five hundred forty".