38979821 has 2 divisors, whose sum is σ = 38979822. Its totient is φ = 38979820.

The previous prime is 38979769. The next prime is 38979823. The reversal of 38979821 is 12897983.

38979821 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., 38613796 + 366025 = 6214^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 38979821 - 2⁶ = 38979757 is a prime.

Together with 38979823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38979823) 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, 19489910 + 19489911.

It is an arithmetic number, because the mean of its divisors is an integer number (19489911).

Almost surely, 2^38979821 is an apocalyptic number.

It is an amenable number.

38979821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38979821 is an equidigital number, since it uses as much as digits as its factorization.

38979821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 38979821 is about 6243.3821763528. The cubic root of 38979821 is about 339.0626459583.

It can be divided in two parts, 3897982 and 1, that added together give a palindrome (3897983).

The spelling of 38979821 in words is "thirty-eight million, nine hundred seventy-nine thousand, eight hundred twenty-one".