12400356 has 12 divisors (see below), whose sum is σ = 28934192. Its totient is φ = 4133448.

The previous prime is 12400343. The next prime is 12400373. The reversal of 12400356 is 65300421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 516670 + ... + 516693.

Almost surely, 2^12400356 is an apocalyptic number.

It is an amenable number.

12400356 is an abundant number, since it is smaller than the sum of its proper divisors (16533836).

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

12400356 is a wasteful number, since it uses less digits than its factorization.

12400356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033370 (or 1033368 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 12400356 is about 3521.4139205722. The cubic root of 12400356 is about 231.4611204682.

Adding to 12400356 its reverse (65300421), we get a palindrome (77700777).

The spelling of 12400356 in words is "twelve million, four hundred thousand, three hundred fifty-six".