38544721 has 2 divisors, whose sum is σ = 38544722. Its totient is φ = 38544720.

The previous prime is 38544719. The next prime is 38544739. The reversal of 38544721 is 12744583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 11296321 = 5220^2 + 3361^2 .

It is an emirp because it is prime and its reverse (12744583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38544721 - 2¹ = 38544719 is a prime.

Together with 38544719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38544791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19272360 + 19272361.

It is an arithmetic number, because the mean of its divisors is an integer number (19272361).

Almost surely, 2^38544721 is an apocalyptic number.

It is an amenable number.

38544721 is a deficient number, since it is larger than the sum of its proper divisors (1).

38544721 is an equidigital number, since it uses as much as digits as its factorization.

38544721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 34.

The square root of 38544721 is about 6208.4394979737. The cubic root of 38544721 is about 337.7963626382.

The spelling of 38544721 in words is "thirty-eight million, five hundred forty-four thousand, seven hundred twenty-one".