1388479109 has 4 divisors (see below), whose sum is σ = 1388689260. Its totient is φ = 1388268960.

The previous prime is 1388479051. The next prime is 1388479129. The reversal of 1388479109 is 9019748831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9019748831 = 103 ⋅87570377.

It can be written as a sum of positive squares in 2 ways, for example, as 907334884 + 481144225 = 30122^2 + 21935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388479109 - 2¹⁶ = 1388413573 is a prime.

It is a super-2 number, since 2×1388479109² = 3855748472258867762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388479129) 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 3 ways as a sum of consecutive naturals, for example, 94832 + ... + 108489.

It is an arithmetic number, because the mean of its divisors is an integer number (347172315).

Almost surely, 2^1388479109 is an apocalyptic number.

It is an amenable number.

1388479109 is a deficient number, since it is larger than the sum of its proper divisors (210151).

1388479109 is an equidigital number, since it uses as much as digits as its factorization.

1388479109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210150.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1388479109 is about 37262.3014452945. The cubic root of 1388479109 is about 1115.6118446131.

The spelling of 1388479109 in words is "one billion, three hundred eighty-eight million, four hundred seventy-nine thousand, one hundred nine".