1388022144 has 128 divisors (see below), whose sum is σ = 3812743680. Its totient is φ = 447068160.

The previous prime is 1388022133. The next prime is 1388022149. The reversal of 1388022144 is 4412208831.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388022149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2997657 + ... + 2998119.

It is an arithmetic number, because the mean of its divisors is an integer number (29787060).

Almost surely, 2^1388022144 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 1388022144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906371840).

1388022144 is an abundant number, since it is smaller than the sum of its proper divisors (2424721536).

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

1388022144 is a wasteful number, since it uses less digits than its factorization.

1388022144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 1388022144 is about 37256.1692072602. The cubic root of 1388022144 is about 1115.4894441391.

The spelling of 1388022144 in words is "one billion, three hundred eighty-eight million, twenty-two thousand, one hundred forty-four".