12705540 has 48 divisors (see below), whose sum is σ = 35734272. Its totient is φ = 3373056.

The previous prime is 12705523. The next prime is 12705569. The reversal of 12705540 is 4550721.

It is a super-2 number, since 2×12705540² = 322861493383200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12705540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21732 + ... + 22308.

It is an arithmetic number, because the mean of its divisors is an integer number (744464).

Almost surely, 2^12705540 is an apocalyptic number.

12705540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12705540 is an abundant number, since it is smaller than the sum of its proper divisors (23028732).

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

12705540 is a wasteful number, since it uses less digits than its factorization.

12705540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 12705540 is about 3564.4831322367. The cubic root of 12705540 is about 233.3445754221.

The spelling of 12705540 in words is "twelve million, seven hundred five thousand, five hundred forty".