7881123 has 4 divisors (see below), whose sum is σ = 10508168. Its totient is φ = 5254080.

The previous prime is 7881113. The next prime is 7881151. The reversal of 7881123 is 3211887.

It is a happy number.

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

It is not a de Polignac number, because 7881123 - 2⁶ = 7881059 is a prime.

It is a super-2 number, since 2×7881123² = 124224199482258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7881113) 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, 1313518 + ... + 1313523.

It is an arithmetic number, because the mean of its divisors is an integer number (2627042).

Almost surely, 2^7881123 is an apocalyptic number.

7881123 is a deficient number, since it is larger than the sum of its proper divisors (2627045).

7881123 is a wasteful number, since it uses less digits than its factorization.

7881123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627044.

The product of its digits is 2688, while the sum is 30.

The square root of 7881123 is about 2807.3337884904. Note that the first 3 decimals coincide. The cubic root of 7881123 is about 199.0044105653.

The spelling of 7881123 in words is "seven million, eight hundred eighty-one thousand, one hundred twenty-three".