12400432 has 20 divisors (see below), whose sum is σ = 26210376. Its totient is φ = 5636480.

The previous prime is 12400397. The next prime is 12400441. The reversal of 12400432 is 23400421.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35053 + ... + 35404.

Almost surely, 2^12400432 is an apocalyptic number.

It is an amenable number.

12400432 is an abundant number, since it is smaller than the sum of its proper divisors (13809944).

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

12400432 is a wasteful number, since it uses less digits than its factorization.

12400432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70476 (or 70470 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12400432 is about 3521.4247116757. The cubic root of 12400432 is about 231.4615933312.

Adding to 12400432 its reverse (23400421), we get a palindrome (35800853).

The spelling of 12400432 in words is "twelve million, four hundred thousand, four hundred thirty-two".