8172739723 has 4 divisors (see below), whose sum is σ = 8201824488. Its totient is φ = 8143654960.

The previous prime is 8172739721. The next prime is 8172739741. The reversal of 8172739723 is 3279372718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3279372718 = 2 ⋅1639686359.

It is a cyclic number.

It is not a de Polignac number, because 8172739723 - 2¹ = 8172739721 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8172739721) 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, 14541961 + ... + 14542522.

It is an arithmetic number, because the mean of its divisors is an integer number (2050456122).

Almost surely, 2^8172739723 is an apocalyptic number.

8172739723 is a deficient number, since it is larger than the sum of its proper divisors (29084765).

8172739723 is a wasteful number, since it uses less digits than its factorization.

8172739723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29084764.

The product of its digits is 889056, while the sum is 49.

The square root of 8172739723 is about 90403.2063756590. The cubic root of 8172739723 is about 2014.2925944826.

The spelling of 8172739723 in words is "eight billion, one hundred seventy-two million, seven hundred thirty-nine thousand, seven hundred twenty-three".