11391520 has 72 divisors (see below), whose sum is σ = 31327884. Its totient is φ = 3902976.

The previous prime is 11391511. The next prime is 11391557. The reversal of 11391520 is 2519311.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 659344 = 3276^2 + 812^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11391491 and 11391500.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7114 + ... + 8566.

Almost surely, 2^11391520 is an apocalyptic number.

11391520 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 11391520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15663942).

11391520 is an abundant number, since it is smaller than the sum of its proper divisors (19936364).

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

11391520 is a wasteful number, since it uses less digits than its factorization.

11391520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1467 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 11391520 is about 3375.1325899881. The cubic root of 11391520 is about 225.0058928498.

It can be divided in two parts, 11391 and 520, that added together give a palindrome (11911).

The spelling of 11391520 in words is "eleven million, three hundred ninety-one thousand, five hundred twenty".