1260145989 has 6 divisors (see below), whose sum is σ = 1820210886. Its totient is φ = 840097320.

The previous prime is 1260145979. The next prime is 1260146021. The reversal of 1260145989 is 9895410621.

It can be written as a sum of positive squares in only one way, i.e., 1126743489 + 133402500 = 33567^2 + 11550^2 .

It is not a de Polignac number, because 1260145989 - 2⁹ = 1260145477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260145979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70008102 + ... + 70008119.

It is an arithmetic number, because the mean of its divisors is an integer number (303368481).

Almost surely, 2^1260145989 is an apocalyptic number.

It is an amenable number.

1260145989 is a deficient number, since it is larger than the sum of its proper divisors (560064897).

1260145989 is a wasteful number, since it uses less digits than its factorization.

1260145989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140016227 (or 140016224 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1260145989 is about 35498.5350261106. The cubic root of 1260145989 is about 1080.1240109657.

The spelling of 1260145989 in words is "one billion, two hundred sixty million, one hundred forty-five thousand, nine hundred eighty-nine".