1391520768 has 88 divisors (see below), whose sum is σ = 4046182080. Its totient is φ = 421662720.

The previous prime is 1391520749. The next prime is 1391520791. The reversal of 1391520768 is 8670251931.

It is a tau number, because it is divible by the number of its divisors (88).

It is a super-3 number, since 3×1391520768³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13203 + ... + 54381.

Almost surely, 2^1391520768 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 1391520768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2023091040).

1391520768 is an abundant number, since it is smaller than the sum of its proper divisors (2654661312).

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

1391520768 is a wasteful number, since it uses less digits than its factorization.

1391520768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41213 (or 41195 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1391520768 is about 37303.0932765635. The cubic root of 1391520768 is about 1116.4258854235.

The spelling of 1391520768 in words is "one billion, three hundred ninety-one million, five hundred twenty thousand, seven hundred sixty-eight".