1989319850 has 24 divisors (see below), whose sum is σ = 4228726368. Its totient is φ = 682052400.

The previous prime is 1989319823. The next prime is 1989319867. The reversal of 1989319850 is 589139891.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1989319792 and 1989319801.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2841536 + ... + 2842235.

It is an arithmetic number, because the mean of its divisors is an integer number (176196932).

Almost surely, 2^1989319850 is an apocalyptic number.

1989319850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989319850 is an abundant number, since it is smaller than the sum of its proper divisors (2239406518).

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

1989319850 is a wasteful number, since it uses less digits than its factorization.

1989319850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683790 (or 5683785 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 53.

The square root of 1989319850 is about 44601.7920043579. The cubic root of 1989319850 is about 1257.6743549965.

The spelling of 1989319850 in words is "one billion, nine hundred eighty-nine million, three hundred nineteen thousand, eight hundred fifty".