1989572165 has 8 divisors (see below), whose sum is σ = 2728556160. Its totient is φ = 1364278032.

The previous prime is 1989572161. The next prime is 1989572183. The reversal of 1989572165 is 5612759891.

It is a happy number.

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 1989572165 - 2² = 1989572161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989572161) 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 in 7 ways as a sum of consecutive naturals, for example, 28422425 + ... + 28422494.

It is an arithmetic number, because the mean of its divisors is an integer number (341069520).

Almost surely, 2^1989572165 is an apocalyptic number.

It is an amenable number.

1989572165 is a deficient number, since it is larger than the sum of its proper divisors (738983995).

1989572165 is an equidigital number, since it uses as much as digits as its factorization.

1989572165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56844931.

The product of its digits is 1360800, while the sum is 53.

The square root of 1989572165 is about 44604.6204445235. The cubic root of 1989572165 is about 1257.7275250435.

The spelling of 1989572165 in words is "one billion, nine hundred eighty-nine million, five hundred seventy-two thousand, one hundred sixty-five".