43644994 has 4 divisors (see below), whose sum is σ = 65467494. Its totient is φ = 21822496.

The previous prime is 43644983. The next prime is 43645003. The reversal of 43644994 is 49944634.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29106025 + 14538969 = 5395^2 + 3813^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43644994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911247 + ... + 10911250.

Almost surely, 2^43644994 is an apocalyptic number.

43644994 is a deficient number, since it is larger than the sum of its proper divisors (21822500).

43644994 is a wasteful number, since it uses less digits than its factorization.

43644994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21822499.

The product of its digits is 373248, while the sum is 43.

The square root of 43644994 is about 6606.4358015499. The cubic root of 43644994 is about 352.0828027053.

The spelling of 43644994 in words is "forty-three million, six hundred forty-four thousand, nine hundred ninety-four".