11581638 has 16 divisors (see below), whose sum is σ = 23347200. Its totient is φ = 3829896.

The previous prime is 11581597. The next prime is 11581711. The reversal of 11581638 is 83618511.

It is a junction number, because it is equal to n+sod(n) for n = 11581599 and 11581608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6838 + ... + 8361.

It is an arithmetic number, because the mean of its divisors is an integer number (1459200).

Almost surely, 2^11581638 is an apocalyptic number.

11581638 is an abundant number, since it is smaller than the sum of its proper divisors (11765562).

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

11581638 is a wasteful number, since it uses less digits than its factorization.

11581638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15331.

The product of its digits is 5760, while the sum is 33.

The square root of 11581638 is about 3403.1805711716. The cubic root of 11581638 is about 226.2507332882.

The spelling of 11581638 in words is "eleven million, five hundred eighty-one thousand, six hundred thirty-eight".