1388868849 has 10 divisors (see below), whose sum is σ = 2074730130. Its totient is φ = 925912512.

The previous prime is 1388868829. The next prime is 1388868853. The reversal of 1388868849 is 9488688831.

It can be written as a sum of positive squares in only one way, i.e., 1019652624 + 369216225 = 31932^2 + 19215^2 .

It is not a de Polignac number, because 1388868849 - 2¹⁵ = 1388836081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388868829) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8573184 + ... + 8573345.

It is an arithmetic number, because the mean of its divisors is an integer number (207473013).

Almost surely, 2^1388868849 is an apocalyptic number.

It is an amenable number.

1388868849 is a deficient number, since it is larger than the sum of its proper divisors (685861281).

1388868849 is an equidigital number, since it uses as much as digits as its factorization.

1388868849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17146541 (or 17146532 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 63.

The square root of 1388868849 is about 37267.5307607037. The cubic root of 1388868849 is about 1115.7162172997.

The spelling of 1388868849 in words is "one billion, three hundred eighty-eight million, eight hundred sixty-eight thousand, eight hundred forty-nine".