1388381268 has 12 divisors (see below), whose sum is σ = 3239556320. Its totient is φ = 462793752.

The previous prime is 1388381261. The next prime is 1388381297. The reversal of 1388381268 is 8621838831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388381261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57849208 + ... + 57849231.

Almost surely, 2^1388381268 is an apocalyptic number.

It is an amenable number.

1388381268 is an abundant number, since it is smaller than the sum of its proper divisors (1851175052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388381268 is a wasteful number, since it uses less digits than its factorization.

1388381268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115698446 (or 115698444 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 1388381268 is about 37260.9885537139. The cubic root of 1388381268 is about 1115.5856396474.

The spelling of 1388381268 in words is "one billion, three hundred eighty-eight million, three hundred eighty-one thousand, two hundred sixty-eight".