387494621 has 2 divisors, whose sum is σ = 387494622. Its totient is φ = 387494620.

The previous prime is 387494603. The next prime is 387494663. The reversal of 387494621 is 126494783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345439396 + 42055225 = 18586^2 + 6485^2 .

It is an emirp because it is prime and its reverse (126494783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387494621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387494671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193747310 + 193747311.

It is an arithmetic number, because the mean of its divisors is an integer number (193747311).

Almost surely, 2^387494621 is an apocalyptic number.

It is an amenable number.

387494621 is a deficient number, since it is larger than the sum of its proper divisors (1).

387494621 is an equidigital number, since it uses as much as digits as its factorization.

387494621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 387494621 is about 19684.8830578188. The cubic root of 387494621 is about 729.0464945135.

The spelling of 387494621 in words is "three hundred eighty-seven million, four hundred ninety-four thousand, six hundred twenty-one".