165367989 has 12 divisors (see below), whose sum is σ = 239465772. Its totient is φ = 109968000.

The previous prime is 165367957. The next prime is 165368009. The reversal of 165367989 is 989763561.

165367989 is a `hidden beast` number, since 16 + 536 + 7 + 98 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 164480625 + 887364 = 12825^2 + 942^2 .

It is not a de Polignac number, because 165367989 - 2⁵ = 165367957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165267989) 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, 19302 + ... + 26519.

It is an arithmetic number, because the mean of its divisors is an integer number (19955481).

Almost surely, 2^165367989 is an apocalyptic number.

It is an amenable number.

165367989 is a deficient number, since it is larger than the sum of its proper divisors (74097783).

165367989 is a wasteful number, since it uses less digits than its factorization.

165367989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46228 (or 46225 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 165367989 is about 12859.5485535068. The cubic root of 165367989 is about 548.8880996615. Note that the first 3 decimals are identical.

The spelling of 165367989 in words is "one hundred sixty-five million, three hundred sixty-seven thousand, nine hundred eighty-nine".