168423881 has 4 divisors (see below), whose sum is σ = 168463764. Its totient is φ = 168384000.

The previous prime is 168423869. The next prime is 168423907. The reversal of 168423881 is 188324861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123654400 + 44769481 = 11120^2 + 6691^2 .

It is a cyclic number.

It is not a de Polignac number, because 168423881 - 2¹⁴ = 168407497 is a prime.

It is a super-3 number, since 3×168423881³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168423821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12740 + ... + 22341.

It is an arithmetic number, because the mean of its divisors is an integer number (42115941).

Almost surely, 2^168423881 is an apocalyptic number.

It is an amenable number.

168423881 is a deficient number, since it is larger than the sum of its proper divisors (39883).

168423881 is an equidigital number, since it uses as much as digits as its factorization.

168423881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39882.

The product of its digits is 73728, while the sum is 41.

The square root of 168423881 is about 12977.8226602154. The cubic root of 168423881 is about 552.2485151824.

The spelling of 168423881 in words is "one hundred sixty-eight million, four hundred twenty-three thousand, eight hundred eighty-one".