168521742 has 32 divisors (see below), whose sum is σ = 374931360. Its totient is φ = 56108160.

The previous prime is 168521729. The next prime is 168521747. The reversal of 168521742 is 247125861.

168521742 is a `hidden beast` number, since 1 + 68 + 521 + 74 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 168521697 and 168521706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168521747) 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 15 ways as a sum of consecutive naturals, for example, 72348 + ... + 74640.

It is an arithmetic number, because the mean of its divisors is an integer number (11716605).

Almost surely, 2^168521742 is an apocalyptic number.

168521742 is an abundant number, since it is smaller than the sum of its proper divisors (206409618).

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

168521742 is a wasteful number, since it uses less digits than its factorization.

168521742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665 (or 3659 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 168521742 is about 12981.5924292823. The cubic root of 168521742 is about 552.3554539527.

The spelling of 168521742 in words is "one hundred sixty-eight million, five hundred twenty-one thousand, seven hundred forty-two".