12631540 has 12 divisors (see below), whose sum is σ = 26526276. Its totient is φ = 5052608.

The previous prime is 12631529. The next prime is 12631573. The reversal of 12631540 is 4513621.

It can be written as a sum of positive squares in 2 ways, for example, as 1582564 + 11048976 = 1258^2 + 3324^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315769 + ... + 315808.

It is an arithmetic number, because the mean of its divisors is an integer number (2210523).

Almost surely, 2^12631540 is an apocalyptic number.

12631540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12631540 is an abundant number, since it is smaller than the sum of its proper divisors (13894736).

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

12631540 is a wasteful number, since it uses less digits than its factorization.

12631540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631586 (or 631584 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12631540 is about 3554.0877873232. The cubic root of 12631540 is about 232.8906755019.

The spelling of 12631540 in words is "twelve million, six hundred thirty-one thousand, five hundred forty".