172642187 has 4 divisors (see below), whose sum is σ = 172759776. Its totient is φ = 172524600.

The previous prime is 172642181. The next prime is 172642219. The reversal of 172642187 is 781246271.

172642187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172642187 - 2²⁴ = 155864971 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 172642187.

It is not an unprimeable number, because it can be changed into a prime (172642181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56564 + ... + 59537.

It is an arithmetic number, because the mean of its divisors is an integer number (43189944).

Almost surely, 2^172642187 is an apocalyptic number.

172642187 is a deficient number, since it is larger than the sum of its proper divisors (117589).

172642187 is a wasteful number, since it uses less digits than its factorization.

172642187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117588.

The product of its digits is 37632, while the sum is 38.

The square root of 172642187 is about 13139.3373881638. The cubic root of 172642187 is about 556.8210474959.

The spelling of 172642187 in words is "one hundred seventy-two million, six hundred forty-two thousand, one hundred eighty-seven".