43994643 has 32 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 22726560.

The previous prime is 43994627. The next prime is 43994651. The reversal of 43994643 is 34649934.

It is not a de Polignac number, because 43994643 - 2⁴ = 43994627 is a prime.

It is a super-2 number, since 2×43994643² = 3871057225394898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43994595 and 43994604.

It is not an unprimeable number, because it can be changed into a prime (43994693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52018 + ... + 52856.

It is an arithmetic number, because the mean of its divisors is an integer number (2298240).

Almost surely, 2^43994643 is an apocalyptic number.

43994643 is a deficient number, since it is larger than the sum of its proper divisors (29549037).

43994643 is a wasteful number, since it uses less digits than its factorization.

43994643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087.

The product of its digits is 279936, while the sum is 42.

The square root of 43994643 is about 6632.8457693512. The cubic root of 43994643 is about 353.0205056208.

The spelling of 43994643 in words is "forty-three million, nine hundred ninety-four thousand, six hundred forty-three".