38929621 has 2 divisors, whose sum is σ = 38929622. Its totient is φ = 38929620.

The previous prime is 38929619. The next prime is 38929633. The reversal of 38929621 is 12692983.

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., 27973521 + 10956100 = 5289^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 38929621 - 2¹ = 38929619 is a prime.

Together with 38929619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38921621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19464810 + 19464811.

It is an arithmetic number, because the mean of its divisors is an integer number (19464811).

Almost surely, 2^38929621 is an apocalyptic number.

It is an amenable number.

38929621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38929621 is an equidigital number, since it uses as much as digits as its factorization.

38929621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 38929621 is about 6239.3606242948. The cubic root of 38929621 is about 338.9170299583.

The spelling of 38929621 in words is "thirty-eight million, nine hundred twenty-nine thousand, six hundred twenty-one".