172179985 has 8 divisors (see below), whose sum is σ = 207322920. Its totient is φ = 137272704.

The previous prime is 172179979. The next prime is 172179991. The reversal of 172179985 is 589971271.

It is an interprime number because it is at equal distance from previous prime (172179979) and next prime (172179991).

It can be written as a sum of positive squares in 4 ways, for example, as 58629649 + 113550336 = 7657^2 + 10656^2 .

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 172179985 - 2⁷ = 172179857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57300 + ... + 60229.

It is an arithmetic number, because the mean of its divisors is an integer number (25915365).

Almost surely, 2^172179985 is an apocalyptic number.

It is an amenable number.

172179985 is a deficient number, since it is larger than the sum of its proper divisors (35142935).

172179985 is a wasteful number, since it uses less digits than its factorization.

172179985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117827.

The product of its digits is 317520, while the sum is 49.

The square root of 172179985 is about 13121.7371182325. The cubic root of 172179985 is about 556.3236916215.

The spelling of 172179985 in words is "one hundred seventy-two million, one hundred seventy-nine thousand, nine hundred eighty-five".