12904640 has 84 divisors (see below), whose sum is σ = 35789616. Its totient is φ = 4419072.

The previous prime is 12904637. The next prime is 12904643. The reversal of 12904640 is 4640921.

It is an interprime number because it is at equal distance from previous prime (12904637) and next prime (12904643).

It is not an unprimeable number, because it can be changed into a prime (12904643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15269 + ... + 16091.

Almost surely, 2^12904640 is an apocalyptic number.

12904640 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 12904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17894808).

12904640 is an abundant number, since it is smaller than the sum of its proper divisors (22884976).

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

12904640 is an equidigital number, since it uses as much as digits as its factorization.

12904640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 12904640 is about 3592.3028825532. The cubic root of 12904640 is about 234.5571257574.

The spelling of 12904640 in words is "twelve million, nine hundred four thousand, six hundred forty".