168490321 has 8 divisors (see below), whose sum is σ = 170449344. Its totient is φ = 166537200.

The previous prime is 168490307. The next prime is 168490337. The reversal of 168490321 is 123094861.

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 168490321 - 2¹⁷ = 168359249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168490381) 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, 82110 + ... + 84136.

It is an arithmetic number, because the mean of its divisors is an integer number (21306168).

Almost surely, 2^168490321 is an apocalyptic number.

It is an amenable number.

168490321 is a deficient number, since it is larger than the sum of its proper divisors (1959023).

168490321 is a wasteful number, since it uses less digits than its factorization.

168490321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 168490321 is about 12980.3821592432. The cubic root of 168490321 is about 552.3211227950.

The spelling of 168490321 in words is "one hundred sixty-eight million, four hundred ninety thousand, three hundred twenty-one".