1889985636 has 360 divisors, whose sum is σ = 6358923648. Its totient is φ = 479001600.

The previous prime is 1889985623. The next prime is 1889985673. The reversal of 1889985636 is 6365899881.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 19484340 + ... + 19484436.

Almost surely, 2^1889985636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1889985636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3179461824).

1889985636 is an abundant number, since it is smaller than the sum of its proper divisors (4468938012).

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

1889985636 is a wasteful number, since it uses less digits than its factorization.

1889985636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 191 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The square root of 1889985636 is about 43473.9650365595. The cubic root of 1889985636 is about 1236.3824577578.

The spelling of 1889985636 in words is "one billion, eight hundred eighty-nine million, nine hundred eighty-five thousand, six hundred thirty-six".