38444821 has 2 divisors, whose sum is σ = 38444822. Its totient is φ = 38444820.

The previous prime is 38444761. The next prime is 38444827. The reversal of 38444821 is 12844483.

It is a happy number.

38444821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 1368900 = 6089^2 + 1170^2 .

It is an emirp because it is prime and its reverse (12844483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38444821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38444827) 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 as a sum of consecutive naturals, namely, 19222410 + 19222411.

It is an arithmetic number, because the mean of its divisors is an integer number (19222411).

Almost surely, 2^38444821 is an apocalyptic number.

It is an amenable number.

38444821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38444821 is an equidigital number, since it uses as much as digits as its factorization.

38444821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 34.

The square root of 38444821 is about 6200.3887781332. The cubic root of 38444821 is about 337.5042772206.

It can be divided in two parts, 3844482 and 1, that added together give a palindrome (3844483).

The spelling of 38444821 in words is "thirty-eight million, four hundred forty-four thousand, eight hundred twenty-one".