12540404 has 12 divisors (see below), whose sum is σ = 22068228. Its totient is φ = 6235200.

The previous prime is 12540403. The next prime is 12540413. The reversal of 12540404 is 40404521.

It can be written as a sum of positive squares in 2 ways, for example, as 1317904 + 11222500 = 1148^2 + 3350^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7937 + ... + 9384.

It is an arithmetic number, because the mean of its divisors is an integer number (1839019).

Almost surely, 2^12540404 is an apocalyptic number.

It is an amenable number.

12540404 is a deficient number, since it is larger than the sum of its proper divisors (9527824).

12540404 is a wasteful number, since it uses less digits than its factorization.

12540404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17506 (or 17504 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 12540404 is about 3541.2432844977. The cubic root of 12540404 is about 232.3292244214.

Adding to 12540404 its reverse (40404521), we get a palindrome (52944925).

The spelling of 12540404 in words is "twelve million, five hundred forty thousand, four hundred four".