43394442 has 128 divisors (see below), whose sum is σ = 116121600. Its totient is φ = 10492416.

The previous prime is 43394437. The next prime is 43394453. The reversal of 43394442 is 24449334.

Added to its reverse (24449334) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is a happy 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 63 ways as a sum of consecutive naturals, for example, 487534 + ... + 487622.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^43394442 is an apocalyptic number.

43394442 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 43394442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58060800).

43394442 is an abundant number, since it is smaller than the sum of its proper divisors (72727158).

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

43394442 is a wasteful number, since it uses less digits than its factorization.

43394442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 41472, while the sum is 33.

The square root of 43394442 is about 6587.4457872532. The cubic root of 43394442 is about 351.4077776333.

Adding to 43394442 its reverse (24449334), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 43394442 in words is "forty-three million, three hundred ninety-four thousand, four hundred forty-two".