1985886720 has 400 divisors, whose sum is σ = 7275469608. Its totient is φ = 517570560.

The previous prime is 1985886713. The next prime is 1985886787. The reversal of 1985886720 is 276885891.

It can be written as a sum of positive squares in 4 ways, for example, as 821166336 + 1164720384 = 28656^2 + 34128^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12648882 + ... + 12649038.

Almost surely, 2^1985886720 is an apocalyptic number.

1985886720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985886720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3637734804).

1985886720 is an abundant number, since it is smaller than the sum of its proper divisors (5289582888).

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

1985886720 is an equidigital number, since it uses as much as digits as its factorization.

1985886720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 1985886720 is about 44563.2889270978. The cubic root of 1985886720 is about 1256.9504483175.

The spelling of 1985886720 in words is "one billion, nine hundred eighty-five million, eight hundred eighty-six thousand, seven hundred twenty".