38243521 has 2 divisors, whose sum is σ = 38243522. Its totient is φ = 38243520.

The previous prime is 38243519. The next prime is 38243531. The reversal of 38243521 is 12534283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 112896 = 6175^2 + 336^2 .

It is an emirp because it is prime and its reverse (12534283) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38243521 - 2¹ = 38243519 is a prime.

Together with 38243519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 38243521.

It is not a weakly prime, because it can be changed into another prime (38243531) 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, 19121760 + 19121761.

It is an arithmetic number, because the mean of its divisors is an integer number (19121761).

Almost surely, 2^38243521 is an apocalyptic number.

It is an amenable number.

38243521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38243521 is an equidigital number, since it uses as much as digits as its factorization.

38243521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

The square root of 38243521 is about 6184.1346201389. The cubic root of 38243521 is about 336.9141800860.

The spelling of 38243521 in words is "thirty-eight million, two hundred forty-three thousand, five hundred twenty-one".