38975721 has 16 divisors (see below), whose sum is σ = 52981824. Its totient is φ = 25481664.

The previous prime is 38975719. The next prime is 38975743. The reversal of 38975721 is 12757983.

38975721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38975721 - 2¹ = 38975719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38975701) 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 in 15 ways as a sum of consecutive naturals, for example, 38595 + ... + 39591.

It is an arithmetic number, because the mean of its divisors is an integer number (3311364).

Almost surely, 2^38975721 is an apocalyptic number.

It is an amenable number.

38975721 is a deficient number, since it is larger than the sum of its proper divisors (14006103).

38975721 is a wasteful number, since it uses less digits than its factorization.

38975721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its digits is 105840, while the sum is 42.

The square root of 38975721 is about 6243.0538200467. The cubic root of 38975721 is about 339.0507577081.

The spelling of 38975721 in words is "thirty-eight million, nine hundred seventy-five thousand, seven hundred twenty-one".