1989908971 has 8 divisors (see below), whose sum is σ = 2031902064. Its totient is φ = 1948314240.

The previous prime is 1989908957. The next prime is 1989908993. The reversal of 1989908971 is 1798099891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1989908971 - 2¹¹ = 1989906923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989905971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89485 + ... + 109486.

It is an arithmetic number, because the mean of its divisors is an integer number (253987758).

Almost surely, 2^1989908971 is an apocalyptic number.

1989908971 is a deficient number, since it is larger than the sum of its proper divisors (41993093).

1989908971 is a wasteful number, since it uses less digits than its factorization.

1989908971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199181.

The product of its (nonzero) digits is 2939328, while the sum is 61.

The square root of 1989908971 is about 44608.3957456441. The cubic root of 1989908971 is about 1257.7984927759.

The spelling of 1989908971 in words is "one billion, nine hundred eighty-nine million, nine hundred eight thousand, nine hundred seventy-one".