172042723 has 2 divisors, whose sum is σ = 172042724. Its totient is φ = 172042722.

The previous prime is 172042721. The next prime is 172042757. The reversal of 172042723 is 327240271.

It is a weak prime.

It is an emirp because it is prime and its reverse (327240271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172042723 - 2¹ = 172042721 is a prime.

Together with 172042721, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 172042691 and 172042700.

It is not a weakly prime, because it can be changed into another prime (172042721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86021361 + 86021362.

It is an arithmetic number, because the mean of its divisors is an integer number (86021362).

Almost surely, 2^172042723 is an apocalyptic number.

172042723 is a deficient number, since it is larger than the sum of its proper divisors (1).

172042723 is an equidigital number, since it uses as much as digits as its factorization.

172042723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 172042723 is about 13116.5057465775. The cubic root of 172042723 is about 556.1758184458.

Adding to 172042723 its reverse (327240271), we get a palindrome (499282994).

The spelling of 172042723 in words is "one hundred seventy-two million, forty-two thousand, seven hundred twenty-three".