38443621 has 2 divisors, whose sum is σ = 38443622. Its totient is φ = 38443620.

The previous prime is 38443619. The next prime is 38443661. The reversal of 38443621 is 12634483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37039396 + 1404225 = 6086^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 38443621 - 2¹ = 38443619 is a prime.

Together with 38443619, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38443661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19221810 + 19221811.

It is an arithmetic number, because the mean of its divisors is an integer number (19221811).

Almost surely, 2^38443621 is an apocalyptic number.

It is an amenable number.

38443621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38443621 is an equidigital number, since it uses as much as digits as its factorization.

38443621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 38443621 is about 6200.2920092525. The cubic root of 38443621 is about 337.5007656133.

The spelling of 38443621 in words is "thirty-eight million, four hundred forty-three thousand, six hundred twenty-one".