1989734697 has 12 divisors (see below), whose sum is σ = 2877897984. Its totient is φ = 1324719000.

The previous prime is 1989734687. The next prime is 1989734717. The reversal of 1989734697 is 7964379891.

It is not a de Polignac number, because 1989734697 - 2⁷ = 1989734569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1989734687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140433 + ... + 153950.

It is an arithmetic number, because the mean of its divisors is an integer number (239824832).

Almost surely, 2^1989734697 is an apocalyptic number.

It is an amenable number.

1989734697 is a deficient number, since it is larger than the sum of its proper divisors (888163287).

1989734697 is a wasteful number, since it uses less digits than its factorization.

1989734697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295140 (or 295137 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 1989734697 is about 44606.4423261932. The cubic root of 1989734697 is about 1257.7617728426.

The spelling of 1989734697 in words is "one billion, nine hundred eighty-nine million, seven hundred thirty-four thousand, six hundred ninety-seven".