38503721 has 2 divisors, whose sum is σ = 38503722. Its totient is φ = 38503720.

The previous prime is 38503711. The next prime is 38503723. The reversal of 38503721 is 12730583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 2371600 = 6011^2 + 1540^2 .

It is an emirp because it is prime and its reverse (12730583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38503721 - 2¹⁰ = 38502697 is a prime.

It is a Sophie Germain prime.

Together with 38503723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38503723) 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, 19251860 + 19251861.

It is an arithmetic number, because the mean of its divisors is an integer number (19251861).

Almost surely, 2^38503721 is an apocalyptic number.

It is an amenable number.

38503721 is a deficient number, since it is larger than the sum of its proper divisors (1).

38503721 is an equidigital number, since it uses as much as digits as its factorization.

38503721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 38503721 is about 6205.1366624757. The cubic root of 38503721 is about 337.6765488735.

The spelling of 38503721 in words is "thirty-eight million, five hundred three thousand, seven hundred twenty-one".