12520431 has 72 divisors (see below), whose sum is σ = 24008400. Its totient is φ = 6209280.

The previous prime is 12520421. The next prime is 12520447. The reversal of 12520431 is 13402521.

It is not a de Polignac number, because 12520431 - 2⁵ = 12520399 is a prime.

It is a super-3 number, since 3×12520431³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 140635 + ... + 140723.

It is an arithmetic number, because the mean of its divisors is an integer number (333450).

Almost surely, 2^12520431 is an apocalyptic number.

12520431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12520431 is a deficient number, since it is larger than the sum of its proper divisors (11487969).

12520431 is a wasteful number, since it uses less digits than its factorization.

12520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12520431 is about 3538.4221059676. The cubic root of 12520431 is about 232.2058159222.

Adding to 12520431 its reverse (13402521), we get a palindrome (25922952).

The spelling of 12520431 in words is "twelve million, five hundred twenty thousand, four hundred thirty-one".