389620261 has 2 divisors, whose sum is σ = 389620262. Its totient is φ = 389620260.

The previous prime is 389620193. The next prime is 389620333. The reversal of 389620261 is 162026983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228584161 + 161036100 = 15119^2 + 12690^2 .

It is a cyclic number.

It is not a de Polignac number, because 389620261 - 2¹¹ = 389618213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389620261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389620661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194810130 + 194810131.

It is an arithmetic number, because the mean of its divisors is an integer number (194810131).

Almost surely, 2^389620261 is an apocalyptic number.

It is an amenable number.

389620261 is a deficient number, since it is larger than the sum of its proper divisors (1).

389620261 is an equidigital number, since it uses as much as digits as its factorization.

389620261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 389620261 is about 19738.8009007640. The cubic root of 389620261 is about 730.3771498320.

The spelling of 389620261 in words is "three hundred eighty-nine million, six hundred twenty thousand, two hundred sixty-one".