12405620 has 48 divisors (see below), whose sum is σ = 27412560. Its totient is φ = 4709376.

The previous prime is 12405587. The next prime is 12405623. The reversal of 12405620 is 2650421.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 763876 + 11641744 = 874^2 + 3412^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12405592 and 12405601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42194 + ... + 42486.

It is an arithmetic number, because the mean of its divisors is an integer number (571095).

Almost surely, 2^12405620 is an apocalyptic number.

12405620 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 12405620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13706280).

12405620 is an abundant number, since it is smaller than the sum of its proper divisors (15006940).

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

12405620 is a wasteful number, since it uses less digits than its factorization.

12405620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12405620 is about 3522.1612683124. The cubic root of 12405620 is about 231.4938678875.

The spelling of 12405620 in words is "twelve million, four hundred five thousand, six hundred twenty".