1388129388 has 24 divisors (see below), whose sum is σ = 3268686960. Its totient is φ = 458464320.

The previous prime is 1388129381. The next prime is 1388129453. The reversal of 1388129388 is 8839218831.

1388129388 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1388129388.

It is not an unprimeable number, because it can be changed into a prime (1388129381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529323 + ... + 531938.

It is an arithmetic number, because the mean of its divisors is an integer number (136195290).

Almost surely, 2^1388129388 is an apocalyptic number.

It is an amenable number.

1388129388 is an abundant number, since it is smaller than the sum of its proper divisors (1880557572).

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

1388129388 is a wasteful number, since it uses less digits than its factorization.

1388129388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061377 (or 1061375 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 1388129388 is about 37257.6084578707. The cubic root of 1388129388 is about 1115.5181724197.

The spelling of 1388129388 in words is "one billion, three hundred eighty-eight million, one hundred twenty-nine thousand, three hundred eighty-eight".