168190397 has 4 divisors (see below), whose sum is σ = 168521340. Its totient is φ = 167859456.

The previous prime is 168190387. The next prime is 168190403. The reversal of 168190397 is 793091861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793091861 = 2837 ⋅279553.

It can be written as a sum of positive squares in 2 ways, for example, as 151265401 + 16924996 = 12299^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 168190397 - 2⁴ = 168190381 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 (168190327) 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, 164708 + ... + 165725.

It is an arithmetic number, because the mean of its divisors is an integer number (42130335).

Almost surely, 2^168190397 is an apocalyptic number.

It is an amenable number.

168190397 is a deficient number, since it is larger than the sum of its proper divisors (330943).

168190397 is an equidigital number, since it uses as much as digits as its factorization.

168190397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330942.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 168190397 is about 12968.8240407525. The cubic root of 168190397 is about 551.9932053441.

The spelling of 168190397 in words is "one hundred sixty-eight million, one hundred ninety thousand, three hundred ninety-seven".