1985901760 has 28 divisors (see below), whose sum is σ = 4728929328. Its totient is φ = 794360576.

The previous prime is 1985901739. The next prime is 1985901779. The reversal of 1985901760 is 671095891.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1985901760.

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, 3102652 + ... + 3103291.

Almost surely, 2^1985901760 is an apocalyptic number.

1985901760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985901760 is an abundant number, since it is smaller than the sum of its proper divisors (2743027568).

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

1985901760 is an equidigital number, since it uses as much as digits as its factorization.

1985901760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6205960 (or 6205950 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 1985901760 is about 44563.4576755440. The cubic root of 1985901760 is about 1256.9536214571.

The spelling of 1985901760 in words is "one billion, nine hundred eighty-five million, nine hundred one thousand, seven hundred sixty".