12499578 has 72 divisors (see below), whose sum is σ = 33572448. Its totient is φ = 3290976.

The previous prime is 12499577. The next prime is 12499579. The reversal of 12499578 is 87599421.

It is an interprime number because it is at equal distance from previous prime (12499577) and next prime (12499579).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12499577) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21001 + ... + 21587.

It is an arithmetic number, because the mean of its divisors is an integer number (466284).

Almost surely, 2^12499578 is an apocalyptic number.

12499578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12499578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16786224).

12499578 is an abundant number, since it is smaller than the sum of its proper divisors (21072870).

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

12499578 is a wasteful number, since it uses less digits than its factorization.

12499578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 612 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 12499578 is about 3535.4742256167. The cubic root of 12499578 is about 232.0768299839.

The spelling of 12499578 in words is "twelve million, four hundred ninety-nine thousand, five hundred seventy-eight".