1388661120 has 768 divisors, whose sum is σ = 6232412160. Its totient is φ = 276480000.

The previous prime is 1388661119. The next prime is 1388661149. The reversal of 1388661120 is 211668831.

1388661120 is a `hidden beast` number, since 1 + 38 + 8 + 6 + 611 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13749070 + ... + 13749170.

It is an arithmetic number, because the mean of its divisors is an integer number (8115120).

Almost surely, 2^1388661120 is an apocalyptic number.

1388661120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388661120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3116206080).

1388661120 is an abundant number, since it is smaller than the sum of its proper divisors (4843751040).

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

1388661120 is a wasteful number, since it uses less digits than its factorization.

1388661120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1388661120 is about 37264.7436593894. The cubic root of 1388661120 is about 1115.6605897363.

The spelling of 1388661120 in words is "one billion, three hundred eighty-eight million, six hundred sixty-one thousand, one hundred twenty".