12499540 has 12 divisors (see below), whose sum is σ = 26249076. Its totient is φ = 4999808.

The previous prime is 12499537. The next prime is 12499561. The reversal of 12499540 is 4599421.

It can be written as a sum of positive squares in 2 ways, for example, as 7851204 + 4648336 = 2802^2 + 2156^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12499496 and 12499505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312469 + ... + 312508.

It is an arithmetic number, because the mean of its divisors is an integer number (2187423).

Almost surely, 2^12499540 is an apocalyptic number.

12499540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12499540 is an abundant number, since it is smaller than the sum of its proper divisors (13749536).

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

12499540 is a wasteful number, since it uses less digits than its factorization.

12499540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624986 (or 624984 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 12499540 is about 3535.4688515104. The cubic root of 12499540 is about 232.0765948046.

The spelling of 12499540 in words is "twelve million, four hundred ninety-nine thousand, five hundred forty".