38807221 has 2 divisors, whose sum is σ = 38807222. Its totient is φ = 38807220.

The previous prime is 38807213. The next prime is 38807261. The reversal of 38807221 is 12270883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34751025 + 4056196 = 5895^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 38807221 - 2³ = 38807213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38807201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19403610 + 19403611.

It is an arithmetic number, because the mean of its divisors is an integer number (19403611).

Almost surely, 2^38807221 is an apocalyptic number.

It is an amenable number.

38807221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38807221 is an equidigital number, since it uses as much as digits as its factorization.

38807221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 38807221 is about 6229.5442048355. The cubic root of 38807221 is about 338.5614566954.

The spelling of 38807221 in words is "thirty-eight million, eight hundred seven thousand, two hundred twenty-one".