168720039 has 6 divisors (see below), whose sum is σ = 243706736. Its totient is φ = 112480020.

The previous prime is 168720029. The next prime is 168720049. The reversal of 168720039 is 930027861.

It is an interprime number because it is at equal distance from previous prime (168720029) and next prime (168720049).

It is not a de Polignac number, because 168720039 - 2⁷ = 168719911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168719985 and 168720012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168720029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9373327 + ... + 9373344.

Almost surely, 2^168720039 is an apocalyptic number.

168720039 is a deficient number, since it is larger than the sum of its proper divisors (74986697).

168720039 is a wasteful number, since it uses less digits than its factorization.

168720039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18746677 (or 18746674 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 168720039 is about 12989.2278061477. The cubic root of 168720039 is about 552.5720184847.

The spelling of 168720039 in words is "one hundred sixty-eight million, seven hundred twenty thousand, thirty-nine".