38136721 has 4 divisors (see below), whose sum is σ = 43584832. Its totient is φ = 32688612.

The previous prime is 38136719. The next prime is 38136739. The reversal of 38136721 is 12763183.

38136721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38136721 - 2¹ = 38136719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38136701) 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 3 ways as a sum of consecutive naturals, for example, 2724045 + ... + 2724058.

It is an arithmetic number, because the mean of its divisors is an integer number (10896208).

Almost surely, 2^38136721 is an apocalyptic number.

It is an amenable number.

38136721 is a deficient number, since it is larger than the sum of its proper divisors (5448111).

38136721 is an equidigital number, since it uses as much as digits as its factorization.

38136721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448110.

The product of its digits is 6048, while the sum is 31.

The square root of 38136721 is about 6175.4935835122. The cubic root of 38136721 is about 336.6002621485.

The spelling of 38136721 in words is "thirty-eight million, one hundred thirty-six thousand, seven hundred twenty-one".