12904840 has 96 divisors (see below), whose sum is σ = 33203520. Its totient is φ = 4502784.

The previous prime is 12904813. The next prime is 12904841. The reversal of 12904840 is 4840921.

It is a junction number, because it is equal to n+sod(n) for n = 12904799 and 12904808.

It is not an unprimeable number, because it can be changed into a prime (12904841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155439 + ... + 155521.

It is an arithmetic number, because the mean of its divisors is an integer number (345870).

Almost surely, 2^12904840 is an apocalyptic number.

12904840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12904840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16601760).

12904840 is an abundant number, since it is smaller than the sum of its proper divisors (20298680).

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

12904840 is a wasteful number, since it uses less digits than its factorization.

12904840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 12904840 is about 3592.3307197417. The cubic root of 12904840 is about 234.5583374968.

The spelling of 12904840 in words is "twelve million, nine hundred four thousand, eight hundred forty".