12312520 has 32 divisors (see below), whose sum is σ = 30222720. Its totient is φ = 4477120.

The previous prime is 12312511. The next prime is 12312557. The reversal of 12312520 is 2521321.

It is a junction number, because it is equal to n+sod(n) for n = 12312494 and 12312503.

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, 13552 + ... + 14431.

It is an arithmetic number, because the mean of its divisors is an integer number (944460).

Almost surely, 2^12312520 is an apocalyptic number.

12312520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312520 is an abundant number, since it is smaller than the sum of its proper divisors (17910200).

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

12312520 is a wasteful number, since it uses less digits than its factorization.

12312520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28005 (or 28001 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12312520 is about 3508.9200617854. The cubic root of 12312520 is about 230.9133186765.

Adding to 12312520 its reverse (2521321), we get a palindrome (14833841).

The spelling of 12312520 in words is "twelve million, three hundred twelve thousand, five hundred twenty".