12638420 has 48 divisors (see below), whose sum is σ = 28358400. Its totient is φ = 4717440.

The previous prime is 12638419. The next prime is 12638453. The reversal of 12638420 is 2483621.

It is a self number, because there is not a number n which added to its sum of digits gives 12638420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29810 + ... + 30230.

It is an arithmetic number, because the mean of its divisors is an integer number (590800).

Almost surely, 2^12638420 is an apocalyptic number.

12638420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12638420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14179200).

12638420 is an abundant number, since it is smaller than the sum of its proper divisors (15719980).

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

12638420 is a wasteful number, since it uses less digits than its factorization.

12638420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 12638420 is about 3555.0555551215. The cubic root of 12638420 is about 232.9329505539.

The spelling of 12638420 in words is "twelve million, six hundred thirty-eight thousand, four hundred twenty".