1388813888 has 112 divisors (see below), whose sum is σ = 3547189248. Its totient is φ = 523584000.

The previous prime is 1388813887. The next prime is 1388813891. The reversal of 1388813888 is 8883188831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (1388813887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148223 + ... + 157313.

Almost surely, 2^1388813888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388813888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773594624).

1388813888 is an abundant number, since it is smaller than the sum of its proper divisors (2158375360).

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

1388813888 is a wasteful number, since it uses less digits than its factorization.

1388813888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9152 (or 9142 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 56.

The square root of 1388813888 is about 37266.7933688961. The cubic root of 1388813888 is about 1115.7014998822.

The spelling of 1388813888 in words is "one billion, three hundred eighty-eight million, eight hundred thirteen thousand, eight hundred eighty-eight".