12509056 has 64 divisors (see below), whose sum is σ = 29767680. Its totient is φ = 5119488.

The previous prime is 12509009. The next prime is 12509083. The reversal of 12509056 is 65090521.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×12509056² = 312952964022272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an alternating number because its digits alternate between odd and even.

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, 20305 + ... + 20911.

It is an arithmetic number, because the mean of its divisors is an integer number (465120).

Almost surely, 2^12509056 is an apocalyptic number.

12509056 is a gapful number since it is divisible by the number (16) 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 12509056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14883840).

12509056 is an abundant number, since it is smaller than the sum of its proper divisors (17258624).

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

12509056 is an equidigital number, since it uses as much as digits as its factorization.

12509056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 12509056 is about 3536.8143858563. The cubic root of 12509056 is about 232.1354737894.

Adding to 12509056 its reverse (65090521), we get a palindrome (77599577).

The spelling of 12509056 in words is "twelve million, five hundred nine thousand, fifty-six".