1989713565 has 80 divisors (see below), whose sum is σ = 4089993600. Its totient is φ = 906526080.

The previous prime is 1989713549. The next prime is 1989713629. The reversal of 1989713565 is 5653179891.

1989713565 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 71 + 3 + 565 = 666.

It is not a de Polignac number, because 1989713565 - 2⁴ = 1989713549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 988410 + ... + 990420.

It is an arithmetic number, because the mean of its divisors is an integer number (51124920).

Almost surely, 2^1989713565 is an apocalyptic number.

1989713565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1989713565 is an abundant number, since it is smaller than the sum of its proper divisors (2100280035).

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

1989713565 is a wasteful number, since it uses less digits than its factorization.

1989713565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2375 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 1989713565 is about 44606.2054539500. The cubic root of 1989713565 is about 1257.7573201358.

The spelling of 1989713565 in words is "one billion, nine hundred eighty-nine million, seven hundred thirteen thousand, five hundred sixty-five".