705989 has 2 divisors, whose sum is σ = 705990. Its totient is φ = 705988.

The previous prime is 705973. The next prime is 706001. The reversal of 705989 is 989507.

705989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 693889 + 12100 = 833^2 + 110^2 .

It is an emirp because it is prime and its reverse (989507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705989 - 2⁴ = 705973 is a prime.

It is a Sophie Germain 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 (705919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352994 + 352995.

It is an arithmetic number, because the mean of its divisors is an integer number (352995).

2⁷⁰⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

705989 is a deficient number, since it is larger than the sum of its proper divisors (1).

705989 is an equidigital number, since it uses as much as digits as its factorization.

705989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 705989 is about 840.2315157146. The cubic root of 705989 is about 89.0429031881.

It can be divided in two parts, 70598 and 9, that added together give a palindrome (70607).

The spelling of 705989 in words is "seven hundred five thousand, nine hundred eighty-nine".