12800040 has 64 divisors (see below), whose sum is σ = 41895360. Its totient is φ = 3102720.

The previous prime is 12800017. The next prime is 12800041. The reversal of 12800040 is 4000821.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 12799992 and 12800019.

It is not an unprimeable number, because it can be changed into a prime (12800041) 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, 3529 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (654615).

Almost surely, 2^12800040 is an apocalyptic number.

12800040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12800040 is an abundant number, since it is smaller than the sum of its proper divisors (29095320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12800040 is a wasteful number, since it uses less digits than its factorization.

12800040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722 (or 9718 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 12800040 is about 3577.7143541652. The cubic root of 12800040 is about 233.9216627249.

Adding to 12800040 its reverse (4000821), we get a palindrome (16800861).

The spelling of 12800040 in words is "twelve million, eight hundred thousand, forty".