8139556723 has 4 divisors (see below), whose sum is σ = 8140661560. Its totient is φ = 8138451888.

The previous prime is 8139556681. The next prime is 8139556727. The reversal of 8139556723 is 3276559318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8139556723 - 2⁹ = 8139556211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8139556727) 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, 541293 + ... + 556126.

It is an arithmetic number, because the mean of its divisors is an integer number (2035165390).

Almost surely, 2^8139556723 is an apocalyptic number.

8139556723 is a deficient number, since it is larger than the sum of its proper divisors (1104837).

8139556723 is a wasteful number, since it uses less digits than its factorization.

8139556723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104836.

The product of its digits is 1360800, while the sum is 49.

The square root of 8139556723 is about 90219.4919238631. The cubic root of 8139556723 is about 2011.5627495031.

The spelling of 8139556723 in words is "eight billion, one hundred thirty-nine million, five hundred fifty-six thousand, seven hundred twenty-three".