43994621 has 4 divisors (see below), whose sum is σ = 47994144. Its totient is φ = 39995100.

The previous prime is 43994609. The next prime is 43994627. The reversal of 43994621 is 12649934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43994621 - 2¹⁸ = 43732477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43994627) 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, 1999745 + ... + 1999766.

It is an arithmetic number, because the mean of its divisors is an integer number (11998536).

Almost surely, 2^43994621 is an apocalyptic number.

It is an amenable number.

43994621 is a deficient number, since it is larger than the sum of its proper divisors (3999523).

43994621 is a wasteful number, since it uses less digits than its factorization.

43994621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999522.

The product of its digits is 46656, while the sum is 38.

The square root of 43994621 is about 6632.8441109376. The cubic root of 43994621 is about 353.0204467769.

The spelling of 43994621 in words is "forty-three million, nine hundred ninety-four thousand, six hundred twenty-one".