12654640 has 40 divisors (see below), whose sum is σ = 29574000. Its totient is φ = 5035776.

The previous prime is 12654619. The next prime is 12654641. The reversal of 12654640 is 4645621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 12654599 and 12654608.

It is not an unprimeable number, because it can be changed into a prime (12654641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25111 + ... + 25609.

It is an arithmetic number, because the mean of its divisors is an integer number (739350).

Almost surely, 2^12654640 is an apocalyptic number.

12654640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12654640 is an abundant number, since it is smaller than the sum of its proper divisors (16919360).

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

12654640 is a wasteful number, since it uses less digits than its factorization.

12654640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 12654640 is about 3557.3360819580. The cubic root of 12654640 is about 233.0325557609.

The spelling of 12654640 in words is "twelve million, six hundred fifty-four thousand, six hundred forty".