1989972916 has 6 divisors (see below), whose sum is σ = 3482452610. Its totient is φ = 994986456.

The previous prime is 1989972871. The next prime is 1989972917. The reversal of 1989972916 is 6192799891.

It can be written as a sum of positive squares in only one way, i.e., 1861059600 + 128913316 = 43140^2 + 11354^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989972917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248746611 + ... + 248746618.

Almost surely, 2^1989972916 is an apocalyptic number.

It is an amenable number.

1989972916 is a deficient number, since it is larger than the sum of its proper divisors (1492479694).

1989972916 is a wasteful number, since it uses less digits than its factorization.

1989972916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497493233 (or 497493231 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 61.

The square root of 1989972916 is about 44609.1124771610. The cubic root of 1989972916 is about 1257.8119655971.

The spelling of 1989972916 in words is "one billion, nine hundred eighty-nine million, nine hundred seventy-two thousand, nine hundred sixteen".