168538397 has 8 divisors (see below), whose sum is σ = 173098080. Its totient is φ = 164035600.

The previous prime is 168538387. The next prime is 168538507. The reversal of 168538397 is 793835861.

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 168538397 - 2⁶ = 168538333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168538387) 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 7 ways as a sum of consecutive naturals, for example, 8183 + ... + 20100.

It is an arithmetic number, because the mean of its divisors is an integer number (21637260).

Almost surely, 2^168538397 is an apocalyptic number.

It is an amenable number.

168538397 is a deficient number, since it is larger than the sum of its proper divisors (4559683).

168538397 is a wasteful number, since it uses less digits than its factorization.

168538397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28443.

The product of its digits is 1088640, while the sum is 50.

The square root of 168538397 is about 12982.2338986786. The cubic root of 168538397 is about 552.3736497790.

The spelling of 168538397 in words is "one hundred sixty-eight million, five hundred thirty-eight thousand, three hundred ninety-seven".