168406789 has 4 divisors (see below), whose sum is σ = 168443820. Its totient is φ = 168369760.

The previous prime is 168406783. The next prime is 168406793. The reversal of 168406789 is 987604861.

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 2125764 + 166281025 = 1458^2 + 12895^2 .

It is a cyclic number.

It is not a de Polignac number, because 168406789 - 2⁵ = 168406757 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 (168406783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10552 + ... + 21169.

It is an arithmetic number, because the mean of its divisors is an integer number (42110955).

Almost surely, 2^168406789 is an apocalyptic number.

It is an amenable number.

168406789 is a deficient number, since it is larger than the sum of its proper divisors (37031).

168406789 is an equidigital number, since it uses as much as digits as its factorization.

168406789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37030.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 168406789 is about 12977.1641355113. The cubic root of 168406789 is about 552.2298334474.

The spelling of 168406789 in words is "one hundred sixty-eight million, four hundred six thousand, seven hundred eighty-nine".