44057821 has 4 divisors (see below), whose sum is σ = 45132444. Its totient is φ = 42983200.

The previous prime is 44057813. The next prime is 44057891. The reversal of 44057821 is 12875044.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1625625 + 42432196 = 1275^2 + 6514^2 .

It is a cyclic number.

It is not a de Polignac number, because 44057821 - 2³ = 44057813 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44057801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537250 + ... + 537331.

It is an arithmetic number, because the mean of its divisors is an integer number (11283111).

Almost surely, 2^44057821 is an apocalyptic number.

44057821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

44057821 is a deficient number, since it is larger than the sum of its proper divisors (1074623).

44057821 is a wasteful number, since it uses less digits than its factorization.

44057821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074622.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 44057821 is about 6637.6065716492. The cubic root of 44057821 is about 353.1894084723.

The spelling of 44057821 in words is "forty-four million, fifty-seven thousand, eight hundred twenty-one".