1985806880 has 24 divisors (see below), whose sum is σ = 4691469132. Its totient is φ = 794322688.

The previous prime is 1985806843. The next prime is 1985806919. The reversal of 1985806880 is 886085891.

It can be written as a sum of positive squares in 2 ways, for example, as 1845905296 + 139901584 = 42964^2 + 11828^2 .

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, 6205487 + ... + 6205806.

Almost surely, 2^1985806880 is an apocalyptic number.

1985806880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985806880 is an abundant number, since it is smaller than the sum of its proper divisors (2705662252).

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

1985806880 is a wasteful number, since it uses less digits than its factorization.

1985806880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12411308 (or 12411300 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 53.

The square root of 1985806880 is about 44562.3931134763. The cubic root of 1985806880 is about 1256.9336034042.

The spelling of 1985806880 in words is "one billion, nine hundred eighty-five million, eight hundred six thousand, eight hundred eighty".