1255638289 has 8 divisors (see below), whose sum is σ = 1271990720. Its totient is φ = 1239366096.

The previous prime is 1255638277. The next prime is 1255638299. The reversal of 1255638289 is 9828365521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1255638289 - 2⁵ = 1255638257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255638269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11767 + ... + 51475.

It is an arithmetic number, because the mean of its divisors is an integer number (158998840).

Almost surely, 2^1255638289 is an apocalyptic number.

It is an amenable number.

1255638289 is a deficient number, since it is larger than the sum of its proper divisors (16352431).

1255638289 is a wasteful number, since it uses less digits than its factorization.

1255638289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40119.

The product of its digits is 1036800, while the sum is 49.

The square root of 1255638289 is about 35434.9867927166. The cubic root of 1255638289 is about 1078.8345592839.

The spelling of 1255638289 in words is "one billion, two hundred fifty-five million, six hundred thirty-eight thousand, two hundred eighty-nine".