1989397896 has 16 divisors (see below), whose sum is σ = 4973494800. Its totient is φ = 663132624.

The previous prime is 1989397889. The next prime is 1989397897. The reversal of 1989397896 is 6987939891.

1989397896 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1989397896.

It is not an unprimeable number, because it can be changed into a prime (1989397897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41445766 + ... + 41445813.

It is an arithmetic number, because the mean of its divisors is an integer number (310843425).

Almost surely, 2^1989397896 is an apocalyptic number.

It is an amenable number.

1989397896 is an abundant number, since it is smaller than the sum of its proper divisors (2984096904).

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

1989397896 is a wasteful number, since it uses less digits than its factorization.

1989397896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82891588 (or 82891584 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 69.

The square root of 1989397896 is about 44602.6669157798. Note that the first 3 decimals coincide. The cubic root of 1989397896 is about 1257.6908020197.

The spelling of 1989397896 in words is "one billion, nine hundred eighty-nine million, three hundred ninety-seven thousand, eight hundred ninety-six".