38298721 has 2 divisors, whose sum is σ = 38298722. Its totient is φ = 38298720.

The previous prime is 38298719. The next prime is 38298769. The reversal of 38298721 is 12789283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 18147600 = 4489^2 + 4260^2 .

It is a cyclic number.

It is not a de Polignac number, because 38298721 - 2¹ = 38298719 is a prime.

Together with 38298719, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38298781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19149360 + 19149361.

It is an arithmetic number, because the mean of its divisors is an integer number (19149361).

Almost surely, 2^38298721 is an apocalyptic number.

It is an amenable number.

38298721 is a deficient number, since it is larger than the sum of its proper divisors (1).

38298721 is an equidigital number, since it uses as much as digits as its factorization.

38298721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 38298721 is about 6188.5960443383. The cubic root of 38298721 is about 337.0762007506.

The spelling of 38298721 in words is "thirty-eight million, two hundred ninety-eight thousand, seven hundred twenty-one".