44440821 has 6 divisors (see below), whose sum is σ = 64192310. Its totient is φ = 29627208.

The previous prime is 44440813. The next prime is 44440831. The reversal of 44440821 is 12804444.

It is a happy number.

44440821 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in only one way, i.e., 24860196 + 19580625 = 4986^2 + 4425^2 .

It is not a de Polignac number, because 44440821 - 2³ = 44440813 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 (44440831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2468926 + ... + 2468943.

Almost surely, 2^44440821 is an apocalyptic number.

It is an amenable number.

44440821 is a deficient number, since it is larger than the sum of its proper divisors (19751489).

44440821 is a wasteful number, since it uses less digits than its factorization.

44440821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937875 (or 4937872 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 44440821 is about 6666.3949027942. The cubic root of 44440821 is about 354.2098965885.

The spelling of 44440821 in words is "forty-four million, four hundred forty thousand, eight hundred twenty-one".