1388268387 has 12 divisors (see below), whose sum is σ = 2187574584. Its totient is φ = 841374720.

The previous prime is 1388268361. The next prime is 1388268389. The reversal of 1388268387 is 7838628831.

It is not a de Polignac number, because 1388268387 - 2⁸ = 1388268131 is a prime.

It is a super-2 number, since 2×1388268387² = 3854578228687163538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388268389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7011358 + ... + 7011555.

It is an arithmetic number, because the mean of its divisors is an integer number (182297882).

Almost surely, 2^1388268387 is an apocalyptic number.

1388268387 is a deficient number, since it is larger than the sum of its proper divisors (799306197).

1388268387 is a wasteful number, since it uses less digits than its factorization.

1388268387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14022930 (or 14022927 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 1388268387 is about 37259.4737885548. The cubic root of 1388268387 is about 1115.5554049564. Note that the first 3 decimals are identical.

The spelling of 1388268387 in words is "one billion, three hundred eighty-eight million, two hundred sixty-eight thousand, three hundred eighty-seven".