12400434 has 48 divisors (see below), whose sum is σ = 28214784. Its totient is φ = 3931200.

The previous prime is 12400397. The next prime is 12400441. The reversal of 12400434 is 43400421.

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

It is a Curzon 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, 39462 + ... + 39774.

It is an arithmetic number, because the mean of its divisors is an integer number (587808).

Almost surely, 2^12400434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12400434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14107392).

12400434 is an abundant number, since it is smaller than the sum of its proper divisors (15814350).

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

12400434 is a wasteful number, since it uses less digits than its factorization.

12400434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 12400434 is about 3521.4249956516. The cubic root of 12400434 is about 231.4616057750.

Adding to 12400434 its reverse (43400421), we get a palindrome (55800855).

The spelling of 12400434 in words is "twelve million, four hundred thousand, four hundred thirty-four".