43944638 has 4 divisors (see below), whose sum is σ = 65916960. Its totient is φ = 21972318.

The previous prime is 43944631. The next prime is 43944673. The reversal of 43944638 is 83644934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83644934 = 2 ⋅41822467.

It is a super-2 number, since 2×43944638² = 3862262417902088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43944595 and 43944604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43944631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10986158 + ... + 10986161.

It is an arithmetic number, because the mean of its divisors is an integer number (16479240).

Almost surely, 2^43944638 is an apocalyptic number.

43944638 is a deficient number, since it is larger than the sum of its proper divisors (21972322).

43944638 is a wasteful number, since it uses less digits than its factorization.

43944638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21972321.

The product of its digits is 248832, while the sum is 41.

The square root of 43944638 is about 6629.0751994528. The cubic root of 43944638 is about 352.8867053703.

The spelling of 43944638 in words is "forty-three million, nine hundred forty-four thousand, six hundred thirty-eight".