172823387 has 4 divisors (see below), whose sum is σ = 188534616. Its totient is φ = 157112160.

The previous prime is 172823369. The next prime is 172823389. The reversal of 172823387 is 783328271.

172823387 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, and also an emirpimes, since its reverse is a distinct semiprime: 783328271 = 11 ⋅71211661.

It is a cyclic number.

It is not a de Polignac number, because 172823387 - 2¹² = 172819291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172823389) 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, 7855598 + ... + 7855619.

It is an arithmetic number, because the mean of its divisors is an integer number (47133654).

Almost surely, 2^172823387 is an apocalyptic number.

172823387 is a deficient number, since it is larger than the sum of its proper divisors (15711229).

172823387 is a wasteful number, since it uses less digits than its factorization.

172823387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15711228.

The product of its digits is 112896, while the sum is 41.

The square root of 172823387 is about 13146.2309047118. The cubic root of 172823387 is about 557.0157868718.

The spelling of 172823387 in words is "one hundred seventy-two million, eight hundred twenty-three thousand, three hundred eighty-seven".