168505389 has 48 divisors (see below), whose sum is σ = 269629360. Its totient is φ = 100776960.

The previous prime is 168505369. The next prime is 168505397. The reversal of 168505389 is 983505861.

168505389 is a `hidden beast` number, since 1 + 68 + 50 + 538 + 9 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 25583364 + 142922025 = 5058^2 + 11955^2 .

It is not a de Polignac number, because 168505389 - 2¹¹ = 168503341 is a prime.

It is a super-2 number, since 2×168505389² = 56788132244082642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168505339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 930879 + ... + 931059.

Almost surely, 2^168505389 is an apocalyptic number.

It is an amenable number.

168505389 is a deficient number, since it is larger than the sum of its proper divisors (101123971).

168505389 is a wasteful number, since it uses less digits than its factorization.

168505389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 168505389 is about 12980.9625606116. The cubic root of 168505389 is about 552.3375868992.

The spelling of 168505389 in words is "one hundred sixty-eight million, five hundred five thousand, three hundred eighty-nine".