1393369728 has 128 divisors (see below), whose sum is σ = 3853396800. Its totient is φ = 445562880.

The previous prime is 1393369723. The next prime is 1393369763. The reversal of 1393369728 is 8279633931.

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

It is not an unprimeable number, because it can be changed into a prime (1393369723) 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, 2349400 + ... + 2349992.

Almost surely, 2^1393369728 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 1393369728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1926698400).

1393369728 is an abundant number, since it is smaller than the sum of its proper divisors (2460027072).

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

1393369728 is a wasteful number, since it uses less digits than its factorization.

1393369728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 838 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 51.

The square root of 1393369728 is about 37327.8679809067. The cubic root of 1393369728 is about 1116.9201439972.

The spelling of 1393369728 in words is "one billion, three hundred ninety-three million, three hundred sixty-nine thousand, seven hundred twenty-eight".