12506540 has 24 divisors (see below), whose sum is σ = 27170640. Its totient is φ = 4829888.

The previous prime is 12506537. The next prime is 12506561. The reversal of 12506540 is 4560521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10202 + ... + 11361.

It is an arithmetic number, because the mean of its divisors is an integer number (1132110).

Almost surely, 2^12506540 is an apocalyptic number.

12506540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12506540 is an abundant number, since it is smaller than the sum of its proper divisors (14664100).

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

12506540 is a wasteful number, since it uses less digits than its factorization.

12506540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21601 (or 21599 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 12506540 is about 3536.4586806578. The cubic root of 12506540 is about 232.1199092785.

The spelling of 12506540 in words is "twelve million, five hundred six thousand, five hundred forty".