43897649 has 4 divisors (see below), whose sum is σ = 43923264. Its totient is φ = 43872036.

The previous prime is 43897627. The next prime is 43897661. The reversal of 43897649 is 94679834.

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 a de Polignac number, because none of the positive numbers 2^k-43897649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43897597 and 43897606.

It is not an unprimeable number, because it can be changed into a prime (43897849) 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, 10037 + ... + 13730.

It is an arithmetic number, because the mean of its divisors is an integer number (10980816).

Almost surely, 2^43897649 is an apocalyptic number.

It is an amenable number.

43897649 is a deficient number, since it is larger than the sum of its proper divisors (25615).

43897649 is a wasteful number, since it uses less digits than its factorization.

43897649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25614.

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

The square root of 43897649 is about 6625.5300920002. The cubic root of 43897649 is about 352.7608826091.

The spelling of 43897649 in words is "forty-three million, eight hundred ninety-seven thousand, six hundred forty-nine".