12581520 has 80 divisors (see below), whose sum is σ = 44580480. Its totient is φ = 2875392.

The previous prime is 12581519. The next prime is 12581537. The reversal of 12581520 is 2518521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2065 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (557256).

Almost surely, 2^12581520 is an apocalyptic number.

12581520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12581520 is an abundant number, since it is smaller than the sum of its proper divisors (31998960).

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

12581520 is a wasteful number, since it uses less digits than its factorization.

12581520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512 (or 7506 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 12581520 is about 3547.0438395938. The cubic root of 12581520 is about 232.5828586624.

The spelling of 12581520 in words is "twelve million, five hundred eighty-one thousand, five hundred twenty".