1989137328 has 40 divisors (see below), whose sum is σ = 5225707200. Its totient is φ = 651806784.

The previous prime is 1989137299. The next prime is 1989137357. The reversal of 1989137328 is 8237319891.

It is an interprime number because it is at equal distance from previous prime (1989137299) and next prime (1989137357).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348358 + ... + 354021.

It is an arithmetic number, because the mean of its divisors is an integer number (130642680).

Almost surely, 2^1989137328 is an apocalyptic number.

It is an amenable number.

1989137328 is an abundant number, since it is smaller than the sum of its proper divisors (3236569872).

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

1989137328 is a wasteful number, since it uses less digits than its factorization.

1989137328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702449 (or 702443 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 1989137328 is about 44599.7458288722. The cubic root of 1989137328 is about 1257.6358895448.

The spelling of 1989137328 in words is "one billion, nine hundred eighty-nine million, one hundred thirty-seven thousand, three hundred twenty-eight".