172723457 has 4 divisors (see below), whose sum is σ = 174664260. Its totient is φ = 170782656.

The previous prime is 172723427. The next prime is 172723477. The reversal of 172723457 is 754327271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754327271 = 3359 ⋅224569.

It can be written as a sum of positive squares in 2 ways, for example, as 89567296 + 83156161 = 9464^2 + 9119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172723457 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 172723457.

It is not an unprimeable number, because it can be changed into a prime (172723427) 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 3 ways as a sum of consecutive naturals, for example, 970268 + ... + 970445.

It is an arithmetic number, because the mean of its divisors is an integer number (43666065).

Almost surely, 2^172723457 is an apocalyptic number.

It is an amenable number.

172723457 is a deficient number, since it is larger than the sum of its proper divisors (1940803).

172723457 is an equidigital number, since it uses as much as digits as its factorization.

172723457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940802.

The product of its digits is 82320, while the sum is 38.

The square root of 172723457 is about 13142.4296459977. The cubic root of 172723457 is about 556.9084068842.

The spelling of 172723457 in words is "one hundred seventy-two million, seven hundred twenty-three thousand, four hundred fifty-seven".