389677861 has 2 divisors, whose sum is σ = 389677862. Its totient is φ = 389677860.

The previous prime is 389677853. The next prime is 389677879. The reversal of 389677861 is 168776983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383768100 + 5909761 = 19590^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 389677861 - 2³ = 389677853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389677811) 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, 194838930 + 194838931.

It is an arithmetic number, because the mean of its divisors is an integer number (194838931).

Almost surely, 2^389677861 is an apocalyptic number.

It is an amenable number.

389677861 is a deficient number, since it is larger than the sum of its proper divisors (1).

389677861 is an equidigital number, since it uses as much as digits as its factorization.

389677861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 389677861 is about 19740.2599020378. The cubic root of 389677861 is about 730.4131401325.

The spelling of 389677861 in words is "three hundred eighty-nine million, six hundred seventy-seven thousand, eight hundred sixty-one".