1381801728 has 144 divisors (see below), whose sum is σ = 3872284416. Its totient is φ = 436592640.

The previous prime is 1381801723. The next prime is 1381801819. The reversal of 1381801728 is 8271081831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381801723) 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, 2419683 + ... + 2420253.

It is an arithmetic number, because the mean of its divisors is an integer number (26890864).

Almost surely, 2^1381801728 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 1381801728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1936142208).

1381801728 is an abundant number, since it is smaller than the sum of its proper divisors (2490482688).

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

1381801728 is a wasteful number, since it uses less digits than its factorization.

1381801728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 1381801728 is about 37172.5937755223. The cubic root of 1381801728 is about 1113.8205947587.

The spelling of 1381801728 in words is "one billion, three hundred eighty-one million, eight hundred one thousand, seven hundred twenty-eight".