2178123 has 8 divisors (see below), whose sum is σ = 3030528. Its totient is φ = 1388904.

The previous prime is 2178083. The next prime is 2178131. The reversal of 2178123 is 3218712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2178123 - 2¹⁶ = 2112587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2178093 and 2178102.

It is not an unprimeable number, because it can be changed into a prime (2178133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15715 + ... + 15852.

It is an arithmetic number, because the mean of its divisors is an integer number (378816).

2^2178123 is an apocalyptic number.

2178123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2178123 is a deficient number, since it is larger than the sum of its proper divisors (852405).

2178123 is a wasteful number, since it uses less digits than its factorization.

2178123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31593.

The product of its digits is 672, while the sum is 24.

The square root of 2178123 is about 1475.8465367375. The cubic root of 2178123 is about 129.6266010973.

The spelling of 2178123 in words is "two million, one hundred seventy-eight thousand, one hundred twenty-three".