38638261 has 2 divisors, whose sum is σ = 38638262. Its totient is φ = 38638260.

The previous prime is 38638217. The next prime is 38638279. The reversal of 38638261 is 16283683.

38638261 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., 26071236 + 12567025 = 5106^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 38638261 - 2⁷ = 38638133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38638261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38638361) 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, 19319130 + 19319131.

It is an arithmetic number, because the mean of its divisors is an integer number (19319131).

Almost surely, 2^38638261 is an apocalyptic number.

It is an amenable number.

38638261 is a deficient number, since it is larger than the sum of its proper divisors (1).

38638261 is an equidigital number, since it uses as much as digits as its factorization.

38638261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 38638261 is about 6215.9682270745. The cubic root of 38638261 is about 338.0693956692.

The spelling of 38638261 in words is "thirty-eight million, six hundred thirty-eight thousand, two hundred sixty-one".