1388042688 has 56 divisors (see below), whose sum is σ = 3678795792. Its totient is φ = 461891584.

The previous prime is 1388042657. The next prime is 1388042717. The reversal of 1388042688 is 8862408831.

1388042688 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112606 + ... + 124322.

It is an arithmetic number, because the mean of its divisors is an integer number (65692782).

Almost surely, 2^1388042688 is an apocalyptic number.

It is an amenable number.

1388042688 is an abundant number, since it is smaller than the sum of its proper divisors (2290753104).

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

1388042688 is a wasteful number, since it uses less digits than its factorization.

1388042688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12349 (or 12339 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The square root of 1388042688 is about 37256.4449189667. Note that the first 3 decimals coincide. The cubic root of 1388042688 is about 1115.4949475340.

The spelling of 1388042688 in words is "one billion, three hundred eighty-eight million, forty-two thousand, six hundred eighty-eight".