1388398089 has 16 divisors (see below), whose sum is σ = 2027390400. Its totient is φ = 839916096.

The previous prime is 1388398069. The next prime is 1388398097. The reversal of 1388398089 is 9808938831.

It is not a de Polignac number, because 1388398089 - 2¹¹ = 1388396041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388398019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299394 + ... + 303995.

It is an arithmetic number, because the mean of its divisors is an integer number (126711900).

Almost surely, 2^1388398089 is an apocalyptic number.

It is an amenable number.

1388398089 is a deficient number, since it is larger than the sum of its proper divisors (638992311).

1388398089 is a wasteful number, since it uses less digits than its factorization.

1388398089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603464.

The product of its (nonzero) digits is 2985984, while the sum is 57.

The square root of 1388398089 is about 37261.2142716793. The cubic root of 1388398089 is about 1115.5901449397.

The spelling of 1388398089 in words is "one billion, three hundred eighty-eight million, three hundred ninety-eight thousand, eighty-nine".