43998221 has 4 divisors (see below), whose sum is σ = 44014944. Its totient is φ = 43981500.

The previous prime is 43998197. The next prime is 43998223. The reversal of 43998221 is 12289934.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12289934 = 2 ⋅6144967.

It is a cyclic number.

It is not a de Polignac number, because 43998221 - 2¹⁰ = 43997197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43998223) 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, 3455 + ... + 9996.

It is an arithmetic number, because the mean of its divisors is an integer number (11003736).

Almost surely, 2^43998221 is an apocalyptic number.

It is an amenable number.

43998221 is a deficient number, since it is larger than the sum of its proper divisors (16723).

43998221 is a wasteful number, since it uses less digits than its factorization.

43998221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16722.

The product of its digits is 31104, while the sum is 38.

The square root of 43998221 is about 6633.1154821848. The cubic root of 43998221 is about 353.0300755217.

The spelling of 43998221 in words is "forty-three million, nine hundred ninety-eight thousand, two hundred twenty-one".