168972729 has 8 divisors (see below), whose sum is σ = 226008960. Its totient is φ = 112292496.

The previous prime is 168972721. The next prime is 168972773. The reversal of 168972729 is 927279861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 168972729 - 2³ = 168972721 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168972721) 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, 87889 + ... + 89790.

It is an arithmetic number, because the mean of its divisors is an integer number (28251120).

Almost surely, 2^168972729 is an apocalyptic number.

It is an amenable number.

168972729 is a deficient number, since it is larger than the sum of its proper divisors (57036231).

168972729 is a wasteful number, since it uses less digits than its factorization.

168972729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177999.

The product of its digits is 762048, while the sum is 51.

The square root of 168972729 is about 12998.9510730674. The cubic root of 168972729 is about 552.8477410664.

The spelling of 168972729 in words is "one hundred sixty-eight million, nine hundred seventy-two thousand, seven hundred twenty-nine".