168394139 has 8 divisors (see below), whose sum is σ = 175454208. Its totient is φ = 161435880.

The previous prime is 168394123. The next prime is 168394151. The reversal of 168394139 is 931493861.

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 168394139 - 2⁴ = 168394123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168394139.

It is not an unprimeable number, because it can be changed into a prime (168394189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22067 + ... + 28700.

It is an arithmetic number, because the mean of its divisors is an integer number (21931776).

Almost surely, 2^168394139 is an apocalyptic number.

168394139 is a deficient number, since it is larger than the sum of its proper divisors (7060069).

168394139 is a wasteful number, since it uses less digits than its factorization.

168394139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50905.

The product of its digits is 139968, while the sum is 44.

The square root of 168394139 is about 12976.6767317368. The cubic root of 168394139 is about 552.2160060510.

The spelling of 168394139 in words is "one hundred sixty-eight million, three hundred ninety-four thousand, one hundred thirty-nine".