1399271289 has 16 divisors (see below), whose sum is σ = 2013363072. Its totient is φ = 859310208.

The previous prime is 1399271287. The next prime is 1399271323. The reversal of 1399271289 is 9821729931.

It is not a de Polignac number, because 1399271289 - 2¹ = 1399271287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399271281) 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 in 15 ways as a sum of consecutive naturals, for example, 17844 + ... + 55829.

It is an arithmetic number, because the mean of its divisors is an integer number (125835192).

Almost surely, 2^1399271289 is an apocalyptic number.

It is an amenable number.

1399271289 is a deficient number, since it is larger than the sum of its proper divisors (614091783).

1399271289 is a wasteful number, since it uses less digits than its factorization.

1399271289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74176.

The product of its digits is 489888, while the sum is 51.

The square root of 1399271289 is about 37406.8347899151. The cubic root of 1399271289 is about 1118.4948129342.

The spelling of 1399271289 in words is "one billion, three hundred ninety-nine million, two hundred seventy-one thousand, two hundred eighty-nine".