43989647 has 4 divisors (see below), whose sum is σ = 47373480. Its totient is φ = 40605816.

The previous prime is 43989619. The next prime is 43989653. The reversal of 43989647 is 74698934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74698934 = 2 ⋅37349467.

It is a cyclic number.

It is not a de Polignac number, because 43989647 - 2⁸ = 43989391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43989595 and 43989604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43989667) 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, 1691897 + ... + 1691922.

It is an arithmetic number, because the mean of its divisors is an integer number (11843370).

Almost surely, 2^43989647 is an apocalyptic number.

43989647 is a deficient number, since it is larger than the sum of its proper divisors (3383833).

43989647 is a wasteful number, since it uses less digits than its factorization.

43989647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383832.

The product of its digits is 1306368, while the sum is 50.

The square root of 43989647 is about 6632.4691480624. The cubic root of 43989647 is about 353.0071421967.

The spelling of 43989647 in words is "forty-three million, nine hundred eighty-nine thousand, six hundred forty-seven".