12505518 has 48 divisors (see below), whose sum is σ = 28169856. Its totient is φ = 4006800.

The previous prime is 12505501. The next prime is 12505543. The reversal of 12505518 is 81550521.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12505491 and 12505500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82743 + ... + 82893.

It is an arithmetic number, because the mean of its divisors is an integer number (586872).

Almost surely, 2^12505518 is an apocalyptic number.

12505518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12505518 is an abundant number, since it is smaller than the sum of its proper divisors (15664338).

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

12505518 is a wasteful number, since it uses less digits than its factorization.

12505518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 12505518 is about 3536.3141828746. The cubic root of 12505518 is about 232.1135863731.

The spelling of 12505518 in words is "twelve million, five hundred five thousand, five hundred eighteen".