1391728000 has 128 divisors (see below), whose sum is σ = 3726908640. Its totient is φ = 513792000.

The previous prime is 1391727989. The next prime is 1391728003. The reversal of 1391728000 is 8271931.

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 (1391728003) 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, 204655 + ... + 211345.

Almost surely, 2^1391728000 is an apocalyptic number.

1391728000 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 1391728000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1863454320).

1391728000 is an abundant number, since it is smaller than the sum of its proper divisors (2335180640).

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

1391728000 is an equidigital number, since it uses as much as digits as its factorization.

1391728000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733 (or 6711 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1391728000 is about 37305.8708516501. The cubic root of 1391728000 is about 1116.4813038525.

Adding to 1391728000 its reverse (8271931), we get a palindrome (1399999931).

The spelling of 1391728000 in words is "one billion, three hundred ninety-one million, seven hundred twenty-eight thousand".