43400420 has 48 divisors (see below), whose sum is σ = 104901888. Its totient is φ = 14774400.

The previous prime is 43400417. The next prime is 43400429. The reversal of 43400420 is 2400434.

43400420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (43400429) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 20114 + ... + 22166.

It is an arithmetic number, because the mean of its divisors is an integer number (2185456).

Almost surely, 2^43400420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43400420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52450944).

43400420 is an abundant number, since it is smaller than the sum of its proper divisors (61501468).

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

43400420 is a wasteful number, since it uses less digits than its factorization.

43400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220 (or 2218 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 43400420 is about 6587.8995135020. The cubic root of 43400420 is about 351.4239134881.

Adding to 43400420 its reverse (2400434), we get a palindrome (45800854).

The spelling of 43400420 in words is "forty-three million, four hundred thousand, four hundred twenty".