168040387 has 4 divisors (see below), whose sum is σ = 168296040. Its totient is φ = 167784736.

The previous prime is 168040373. The next prime is 168040399. The reversal of 168040387 is 783040861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168040387 - 2¹⁹ = 167516099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168040337) 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, 126838 + ... + 128155.

It is an arithmetic number, because the mean of its divisors is an integer number (42074010).

Almost surely, 2^168040387 is an apocalyptic number.

168040387 is a deficient number, since it is larger than the sum of its proper divisors (255653).

168040387 is an equidigital number, since it uses as much as digits as its factorization.

168040387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255652.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 168040387 is about 12963.0392655426. The cubic root of 168040387 is about 551.8290478727.

The spelling of 168040387 in words is "one hundred sixty-eight million, forty thousand, three hundred eighty-seven".