11580381 has 16 divisors (see below), whose sum is σ = 17212800. Its totient is φ = 7694784.

The previous prime is 11580337. The next prime is 11580419. The reversal of 11580381 is 18308511.

11580381 is a `hidden beast` number, since 1 + 1 + 580 + 3 + 81 = 666.

It is not a de Polignac number, because 11580381 - 2¹⁴ = 11563997 is a prime.

It is a super-2 number, since 2×11580381² = 268210448210322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11580581) 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, 11365 + ... + 12341.

It is an arithmetic number, because the mean of its divisors is an integer number (1075800).

Almost surely, 2^11580381 is an apocalyptic number.

It is an amenable number.

11580381 is a deficient number, since it is larger than the sum of its proper divisors (5632419).

11580381 is an equidigital number, since it uses as much as digits as its factorization.

11580381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 11580381 is about 3402.9958859805. The cubic root of 11580381 is about 226.2425477028.

Adding to 11580381 its reverse (18308511), we get a palindrome (29888892).

The spelling of 11580381 in words is "eleven million, five hundred eighty thousand, three hundred eighty-one".