860442389 has 2 divisors, whose sum is σ = 860442390. Its totient is φ = 860442388.

The previous prime is 860442377. The next prime is 860442433. The reversal of 860442389 is 983244068.

860442389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (860442433) can be obtained adding 860442389 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811680100 + 48762289 = 28490^2 + 6983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-860442389 is a prime.

It is a super-2 number, since 2×860442389² = 1480722209576054642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (860442689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430221194 + 430221195.

It is an arithmetic number, because the mean of its divisors is an integer number (430221195).

Almost surely, 2^860442389 is an apocalyptic number.

It is an amenable number.

860442389 is a deficient number, since it is larger than the sum of its proper divisors (1).

860442389 is an equidigital number, since it uses as much as digits as its factorization.

860442389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 860442389 is about 29333.2982973276. The cubic root of 860442389 is about 951.1315746028.

The spelling of 860442389 in words is "eight hundred sixty million, four hundred forty-two thousand, three hundred eighty-nine".