172403873 has 4 divisors (see below), whose sum is σ = 175230228. Its totient is φ = 169577520.

The previous prime is 172403821. The next prime is 172403909. The reversal of 172403873 is 378304271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378304271 = 103 ⋅3672857.

It can be written as a sum of positive squares in 2 ways, for example, as 91259809 + 81144064 = 9553^2 + 9008^2 .

It is a cyclic number.

It is not a de Polignac number, because 172403873 - 2¹⁶ = 172338337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172403573) 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, 1413086 + ... + 1413207.

It is an arithmetic number, because the mean of its divisors is an integer number (43807557).

Almost surely, 2^172403873 is an apocalyptic number.

It is an amenable number.

172403873 is a deficient number, since it is larger than the sum of its proper divisors (2826355).

172403873 is an equidigital number, since it uses as much as digits as its factorization.

172403873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826354.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 172403873 is about 13130.2655342533. The cubic root of 172403873 is about 556.5647189610.

The spelling of 172403873 in words is "one hundred seventy-two million, four hundred three thousand, eight hundred seventy-three".