43420440 has 64 divisors (see below), whose sum is σ = 148872960. Its totient is φ = 9924480.

The previous prime is 43420439. The next prime is 43420451. The reversal of 43420440 is 4402434.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25006 + ... + 26685.

It is an arithmetic number, because the mean of its divisors is an integer number (2326140).

Almost surely, 2^43420440 is an apocalyptic number.

43420440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43420440 is an abundant number, since it is smaller than the sum of its proper divisors (105452520).

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

43420440 is a wasteful number, since it uses less digits than its factorization.

43420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51712 (or 51708 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 43420440 is about 6589.4187907584. The cubic root of 43420440 is about 351.4779408088.

Adding to 43420440 its reverse (4402434), we get a palindrome (47822874).

The spelling of 43420440 in words is "forty-three million, four hundred twenty thousand, four hundred forty".