12520404 has 72 divisors (see below), whose sum is σ = 35223552. Its totient is φ = 3723840.

The previous prime is 12520399. The next prime is 12520421. The reversal of 12520404 is 40402521.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14077 + ... + 14939.

It is an arithmetic number, because the mean of its divisors is an integer number (489216).

Almost surely, 2^12520404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12520404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17611776).

12520404 is an abundant number, since it is smaller than the sum of its proper divisors (22703148).

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

12520404 is a wasteful number, since it uses less digits than its factorization.

12520404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12520404 is about 3538.4182907056. The cubic root of 12520404 is about 232.2056490067.

Adding to 12520404 its reverse (40402521), we get a palindrome (52922925).

The spelling of 12520404 in words is "twelve million, five hundred twenty thousand, four hundred four".