1295985389 has 2 divisors, whose sum is σ = 1295985390. Its totient is φ = 1295985388.

The previous prime is 1295985371. The next prime is 1295985401. The reversal of 1295985389 is 9835895921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924768100 + 371217289 = 30410^2 + 19267^2 .

It is a cyclic number.

It is not a de Polignac number, because 1295985389 - 2²⁰ = 1294936813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1295985319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647992694 + 647992695.

It is an arithmetic number, because the mean of its divisors is an integer number (647992695).

Almost surely, 2^1295985389 is an apocalyptic number.

It is an amenable number.

1295985389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295985389 is an equidigital number, since it uses as much as digits as its factorization.

1295985389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 59.

The square root of 1295985389 is about 35999.7970688725. The cubic root of 1295985389 is about 1090.2682584695.

The spelling of 1295985389 in words is "one billion, two hundred ninety-five million, nine hundred eighty-five thousand, three hundred eighty-nine".