7894172123 has 4 divisors (see below), whose sum is σ = 8062133280. Its totient is φ = 7726210968.

The previous prime is 7894172087. The next prime is 7894172149. The reversal of 7894172123 is 3212714987.

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 7894172123 - 2¹⁰ = 7894171099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7894172023) 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, 83980508 + ... + 83980601.

It is an arithmetic number, because the mean of its divisors is an integer number (2015533320).

Almost surely, 2^7894172123 is an apocalyptic number.

7894172123 is a deficient number, since it is larger than the sum of its proper divisors (167961157).

7894172123 is a wasteful number, since it uses less digits than its factorization.

7894172123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167961156.

The product of its digits is 169344, while the sum is 44.

The square root of 7894172123 is about 88849.1537551146. The cubic root of 7894172123 is about 1991.1418346260.

The spelling of 7894172123 in words is "seven billion, eight hundred ninety-four million, one hundred seventy-two thousand, one hundred twenty-three".