44021209 has 4 divisors (see below), whose sum is σ = 45441280. Its totient is φ = 42601140.

The previous prime is 44021189. The next prime is 44021213. The reversal of 44021209 is 90212044.

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-44021209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 44021209.

It is not an unprimeable number, because it can be changed into a prime (44021239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709989 + ... + 710050.

It is an arithmetic number, because the mean of its divisors is an integer number (11360320).

Almost surely, 2^44021209 is an apocalyptic number.

It is an amenable number.

44021209 is a deficient number, since it is larger than the sum of its proper divisors (1420071).

44021209 is a wasteful number, since it uses less digits than its factorization.

44021209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420070.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 44021209 is about 6634.8480766330. The cubic root of 44021209 is about 353.0915480255.

The spelling of 44021209 in words is "forty-four million, twenty-one thousand, two hundred nine".