12520000 has 70 divisors (see below), whose sum is σ = 31144718. Its totient is φ = 4992000.

The previous prime is 12519989. The next prime is 12520003. The reversal of 12520000 is 2521.

It can be written as a sum of positive squares in 5 ways, for example, as 9193024 + 3326976 = 3032^2 + 1824^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39844 + ... + 40156.

Almost surely, 2^12520000 is an apocalyptic number.

12520000 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 12520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15572359).

12520000 is an abundant number, since it is smaller than the sum of its proper divisors (18624718).

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

12520000 is an frugal number, since it uses more digits than its factorization.

12520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 12520000 is about 3538.3612025908. The cubic root of 12520000 is about 232.2031514278.

Adding to 12520000 its reverse (2521), we get a palindrome (12522521).

The spelling of 12520000 in words is "twelve million, five hundred twenty thousand".