12840423 has 16 divisors (see below), whose sum is σ = 18362880. Its totient is φ = 7952256.

The previous prime is 12840391. The next prime is 12840427. The reversal of 12840423 is 32404821.

It is not a de Polignac number, because 12840423 - 2⁵ = 12840391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12840393 and 12840402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2436 + ... + 5622.

It is an arithmetic number, because the mean of its divisors is an integer number (1147680).

Almost surely, 2^12840423 is an apocalyptic number.

12840423 is a deficient number, since it is larger than the sum of its proper divisors (5522457).

12840423 is a wasteful number, since it uses less digits than its factorization.

12840423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 12840423 is about 3583.3535968419. The cubic root of 12840423 is about 234.1674052287.

The spelling of 12840423 in words is "twelve million, eight hundred forty thousand, four hundred twenty-three".