43138638 has 12 divisors (see below), whose sum is σ = 93467088. Its totient is φ = 14379540.

The previous prime is 43138619. The next prime is 43138663. The reversal of 43138638 is 83683134.

It is a happy number.

43138638 is a `hidden beast` number, since 4 + 3 + 13 + 8 + 638 = 666.

43138638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1198278 + ... + 1198313.

It is an arithmetic number, because the mean of its divisors is an integer number (7788924).

Almost surely, 2^43138638 is an apocalyptic number.

43138638 is an abundant number, since it is smaller than the sum of its proper divisors (50328450).

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

43138638 is a wasteful number, since it uses less digits than its factorization.

43138638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396599 (or 2396596 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 43138638 is about 6568.0010657734. The cubic root of 43138638 is about 350.7159169229.

The spelling of 43138638 in words is "forty-three million, one hundred thirty-eight thousand, six hundred thirty-eight".