387340621 has 2 divisors, whose sum is σ = 387340622. Its totient is φ = 387340620.

The previous prime is 387340607. The next prime is 387340637. The reversal of 387340621 is 126043783.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369792900 + 17547721 = 19230^2 + 4189^2 .

It is an emirp because it is prime and its reverse (126043783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387340621 - 2²⁵ = 353786189 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387346621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193670310 + 193670311.

It is an arithmetic number, because the mean of its divisors is an integer number (193670311).

Almost surely, 2^387340621 is an apocalyptic number.

It is an amenable number.

387340621 is a deficient number, since it is larger than the sum of its proper divisors (1).

387340621 is an equidigital number, since it uses as much as digits as its factorization.

387340621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 387340621 is about 19680.9710380357. The cubic root of 387340621 is about 728.9499013130.

The spelling of 387340621 in words is "three hundred eighty-seven million, three hundred forty thousand, six hundred twenty-one".