172163987 has 8 divisors (see below), whose sum is σ = 178915200. Its totient is φ = 165487680.

The previous prime is 172163983. The next prime is 172164001. The reversal of 172163987 is 789361271.

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 172163987 - 2² = 172163983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172163983) 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 7 ways as a sum of consecutive naturals, for example, 14018 + ... + 23255.

It is an arithmetic number, because the mean of its divisors is an integer number (22364400).

Almost surely, 2^172163987 is an apocalyptic number.

172163987 is a deficient number, since it is larger than the sum of its proper divisors (6751213).

172163987 is a wasteful number, since it uses less digits than its factorization.

172163987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37453.

The product of its digits is 127008, while the sum is 44.

The square root of 172163987 is about 13121.1275049060. The cubic root of 172163987 is about 556.3064609271.

The spelling of 172163987 in words is "one hundred seventy-two million, one hundred sixty-three thousand, nine hundred eighty-seven".