43864638 has 8 divisors (see below), whose sum is σ = 87729288. Its totient is φ = 14621544.

The previous prime is 43864637. The next prime is 43864643. The reversal of 43864638 is 83646834.

It is a sphenic number, since it is the product of 3 distinct primes.

43864638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 43864638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43864631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3655381 + ... + 3655392.

It is an arithmetic number, because the mean of its divisors is an integer number (10966161).

Almost surely, 2^43864638 is an apocalyptic number.

43864638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

43864638 is a wasteful number, since it uses less digits than its factorization.

43864638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7310778.

The product of its digits is 331776, while the sum is 42.

The square root of 43864638 is about 6623.0384265834. The cubic root of 43864638 is about 352.6724351258.

The spelling of 43864638 in words is "forty-three million, eight hundred sixty-four thousand, six hundred thirty-eight".