195389 has 2 divisors, whose sum is σ = 195390. Its totient is φ = 195388.

The previous prime is 195359. The next prime is 195401. The reversal of 195389 is 983591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195364 + 25 = 442^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 195389 - 2¹⁶ = 129853 is a prime.

It is a super-2 number, since 2×195389² = 76353722642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195319) 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, 97694 + 97695.

It is an arithmetic number, because the mean of its divisors is an integer number (97695).

2¹⁹⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

195389 is a deficient number, since it is larger than the sum of its proper divisors (1).

195389 is an equidigital number, since it uses as much as digits as its factorization.

195389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 195389 is about 442.0282796383. The cubic root of 195389 is about 58.0274345043.

It can be divided in two parts, 195 and 389, that multiplied together give a triangular number (75855 = T₃₈₉).

The spelling of 195389 in words is "one hundred ninety-five thousand, three hundred eighty-nine".