168018397 has 4 divisors (see below), whose sum is σ = 168739740. Its totient is φ = 167297056.

The previous prime is 168018391. The next prime is 168018401. The reversal of 168018397 is 793810861.

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 16088121 + 151930276 = 4011^2 + 12326^2 .

It is a cyclic number.

It is not a de Polignac number, because 168018397 - 2⁷ = 168018269 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 (168018391) 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, 360322 + ... + 360787.

It is an arithmetic number, because the mean of its divisors is an integer number (42184935).

Almost surely, 2^168018397 is an apocalyptic number.

It is an amenable number.

168018397 is a deficient number, since it is larger than the sum of its proper divisors (721343).

168018397 is an equidigital number, since it uses as much as digits as its factorization.

168018397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721342.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 168018397 is about 12962.1910570706. The cubic root of 168018397 is about 551.8049757824.

The spelling of 168018397 in words is "one hundred sixty-eight million, eighteen thousand, three hundred ninety-seven".