1989550964 has 12 divisors (see below), whose sum is σ = 3482090304. Its totient is φ = 994668024.

The previous prime is 1989550957. The next prime is 1989550967. The reversal of 1989550964 is 4690559891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989550967) 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, 26627 + ... + 68469.

It is an arithmetic number, because the mean of its divisors is an integer number (290174192).

Almost surely, 2^1989550964 is an apocalyptic number.

It is an amenable number.

1989550964 is a deficient number, since it is larger than the sum of its proper divisors (1492539340).

1989550964 is a wasteful number, since it uses less digits than its factorization.

1989550964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53734 (or 53732 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 56.

The square root of 1989550964 is about 44604.3827891386. The cubic root of 1989550964 is about 1257.7230575543.

The spelling of 1989550964 in words is "one billion, nine hundred eighty-nine million, five hundred fifty thousand, nine hundred sixty-four".