172445023 has 4 divisors (see below), whose sum is σ = 175367880. Its totient is φ = 169522168.

The previous prime is 172445017. The next prime is 172445027. The reversal of 172445023 is 320544271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320544271 = 433 ⋅740287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172445023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172444982 and 172445000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172445027) 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, 1461340 + ... + 1461457.

It is an arithmetic number, because the mean of its divisors is an integer number (43841970).

Almost surely, 2^172445023 is an apocalyptic number.

172445023 is a deficient number, since it is larger than the sum of its proper divisors (2922857).

172445023 is an equidigital number, since it uses as much as digits as its factorization.

172445023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922856.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 172445023 is about 13131.8324311575. The cubic root of 172445023 is about 556.6089964200.

Adding to 172445023 its reverse (320544271), we get a palindrome (492989294).

The spelling of 172445023 in words is "one hundred seventy-two million, four hundred forty-five thousand, twenty-three".