38238821 has 2 divisors, whose sum is σ = 38238822. Its totient is φ = 38238820.

The previous prime is 38238793. The next prime is 38238829. The reversal of 38238821 is 12883283.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 280900 = 6161^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 38238821 - 2⁶ = 38238757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38238829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19119410 + 19119411.

It is an arithmetic number, because the mean of its divisors is an integer number (19119411).

Almost surely, 2^38238821 is an apocalyptic number.

It is an amenable number.

38238821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38238821 is an equidigital number, since it uses as much as digits as its factorization.

38238821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 38238821 is about 6183.7546037986. The cubic root of 38238821 is about 336.9003776477.

The spelling of 38238821 in words is "thirty-eight million, two hundred thirty-eight thousand, eight hundred twenty-one".