1393728491520 has 416 divisors, whose sum is σ = 4990795958400. Its totient is φ = 368966762496.

The previous prime is 1393728491471. The next prime is 1393728491539. The reversal of 1393728491520 is 251948273931.

1393728491520 is a `hidden beast` number, since 1 + 3 + 9 + 3 + 7 + 28 + 4 + 91 + 520 = 666.

It is a super-2 number, since 2×1393728491520² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76852374 + ... + 76870506.

Almost surely, 2^{1393728491520} is an apocalyptic number.

1393728491520 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 1393728491520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2495397979200).

1393728491520 is an abundant number, since it is smaller than the sum of its proper divisors (3597067466880).

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

1393728491520 is a wasteful number, since it uses less digits than its factorization.

1393728491520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18310 (or 18282 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 1393728491520 in words is "one trillion, three hundred ninety-three billion, seven hundred twenty-eight million, four hundred ninety-one thousand, five hundred twenty".