12400436 has 12 divisors (see below), whose sum is σ = 21730212. Its totient is φ = 6191808.

The previous prime is 12400397. The next prime is 12400441. The reversal of 12400436 is 63400421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 2540836 = 3140^2 + 1594^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (1810851).

Almost surely, 2^12400436 is an apocalyptic number.

It is an amenable number.

12400436 is a deficient number, since it is larger than the sum of its proper divisors (9329776).

12400436 is a wasteful number, since it uses less digits than its factorization.

12400436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 12400436 is about 3521.4252796276. The cubic root of 12400436 is about 231.4616182187.

Adding to 12400436 its reverse (63400421), we get a palindrome (75800857).

The spelling of 12400436 in words is "twelve million, four hundred thousand, four hundred thirty-six".