44638021 has 4 divisors (see below), whose sum is σ = 45844492. Its totient is φ = 43431552.

The previous prime is 44638003. The next prime is 44638067. The reversal of 44638021 is 12083644.

44638021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 35402500 + 9235521 = 5950^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 44638021 - 2¹⁹ = 44113733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44638001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603180 + ... + 603253.

It is an arithmetic number, because the mean of its divisors is an integer number (11461123).

Almost surely, 2^44638021 is an apocalyptic number.

It is an amenable number.

44638021 is a deficient number, since it is larger than the sum of its proper divisors (1206471).

44638021 is a wasteful number, since it uses less digits than its factorization.

44638021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206470.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 44638021 is about 6681.1691342160. The cubic root of 44638021 is about 354.7330427046.

The spelling of 44638021 in words is "forty-four million, six hundred thirty-eight thousand, twenty-one".