38821779929 has 2 divisors, whose sum is σ = 38821779930. Its totient is φ = 38821779928.

The previous prime is 38821779907. The next prime is 38821779977. The reversal of 38821779929 is 92997712883.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38580816400 + 240963529 = 196420^2 + 15523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38821779929 is a prime.

It is not a weakly prime, because it can be changed into another prime (38821779629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19410889964 + 19410889965.

It is an arithmetic number, because the mean of its divisors is an integer number (19410889965).

Almost surely, 2^38821779929 is an apocalyptic number.

It is an amenable number.

38821779929 is a deficient number, since it is larger than the sum of its proper divisors (1).

38821779929 is an equidigital number, since it uses as much as digits as its factorization.

38821779929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 65.

The spelling of 38821779929 in words is "thirty-eight billion, eight hundred twenty-one million, seven hundred seventy-nine thousand, nine hundred twenty-nine".