168873409 has 4 divisors (see below), whose sum is σ = 174696660. Its totient is φ = 163050160.

The previous prime is 168873403. The next prime is 168873421. The reversal of 168873409 is 904378861.

It is a happy number.

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 98565184 + 70308225 = 9928^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 168873409 - 2³ = 168873401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168873401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2911582 + ... + 2911639.

It is an arithmetic number, because the mean of its divisors is an integer number (43674165).

Almost surely, 2^168873409 is an apocalyptic number.

It is an amenable number.

168873409 is a deficient number, since it is larger than the sum of its proper divisors (5823251).

168873409 is an equidigital number, since it uses as much as digits as its factorization.

168873409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823250.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 168873409 is about 12995.1302032723. The cubic root of 168873409 is about 552.7394009026.

The spelling of 168873409 in words is "one hundred sixty-eight million, eight hundred seventy-three thousand, four hundred nine".