1989515964 has 12 divisors (see below), whose sum is σ = 4642203944. Its totient is φ = 663171984.

The previous prime is 1989515963. The next prime is 1989515999. The reversal of 1989515964 is 4695159891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989515963) 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, 82896487 + ... + 82896510.

Almost surely, 2^1989515964 is an apocalyptic number.

It is an amenable number.

1989515964 is an abundant number, since it is smaller than the sum of its proper divisors (2652687980).

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

1989515964 is a wasteful number, since it uses less digits than its factorization.

1989515964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165793004 (or 165793002 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 57.

The square root of 1989515964 is about 44603.9904492860. The cubic root of 1989515964 is about 1257.7156822611.

The spelling of 1989515964 in words is "one billion, nine hundred eighty-nine million, five hundred fifteen thousand, nine hundred sixty-four".