2387946221 has 2 divisors, whose sum is σ = 2387946222. Its totient is φ = 2387946220.

The previous prime is 2387946179. The next prime is 2387946229. The reversal of 2387946221 is 1226497832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2323722025 + 64224196 = 48205^2 + 8014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2387946221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2387946229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1193973110 + 1193973111.

It is an arithmetic number, because the mean of its divisors is an integer number (1193973111).

Almost surely, 2^2387946221 is an apocalyptic number.

It is an amenable number.

2387946221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2387946221 is an equidigital number, since it uses as much as digits as its factorization.

2387946221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2387946221 is about 48866.6166313978. The cubic root of 2387946221 is about 1336.6206936121.

The spelling of 2387946221 in words is "two billion, three hundred eighty-seven million, nine hundred forty-six thousand, two hundred twenty-one".