1388755289 has 8 divisors (see below), whose sum is σ = 1396426248. Its totient is φ = 1381104000.

The previous prime is 1388755229. The next prime is 1388755301. The reversal of 1388755289 is 9825578831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 56505289 + 1332250000 = 7517^2 + 36500^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388755289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1388755229) 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, 149789 + ... + 158789.

It is an arithmetic number, because the mean of its divisors is an integer number (174553281).

Almost surely, 2^1388755289 is an apocalyptic number.

It is an amenable number.

1388755289 is a deficient number, since it is larger than the sum of its proper divisors (7670959).

1388755289 is an equidigital number, since it uses as much as digits as its factorization.

1388755289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9835.

The product of its digits is 4838400, while the sum is 56.

The square root of 1388755289 is about 37266.0071512900. The cubic root of 1388755289 is about 1115.6858078560.

The spelling of 1388755289 in words is "one billion, three hundred eighty-eight million, seven hundred fifty-five thousand, two hundred eighty-nine".