12840038 has 8 divisors (see below), whose sum is σ = 19294632. Its totient is φ = 6408496.

The previous prime is 12840031. The next prime is 12840089. The reversal of 12840038 is 83004821.

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

It is a junction number, because it is equal to n+sod(n) for n = 12839989 and 12840016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4295 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (2411829).

Almost surely, 2^12840038 is an apocalyptic number.

12840038 is a deficient number, since it is larger than the sum of its proper divisors (6454594).

12840038 is a wasteful number, since it uses less digits than its factorization.

12840038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11526.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 12840038 is about 3583.2998758128. The cubic root of 12840038 is about 234.1650648241.

Adding to 12840038 its reverse (83004821), we get a palindrome (95844859).

The spelling of 12840038 in words is "twelve million, eight hundred forty thousand, thirty-eight".