11561838 has 8 divisors (see below), whose sum is σ = 23123688. Its totient is φ = 3853944.

The previous prime is 11561833. The next prime is 11561839. The reversal of 11561838 is 83816511.

It is a sphenic number, since it is the product of 3 distinct primes.

11561838 is an admirable number.

It is a super-3 number, since 3×11561838³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11561799 and 11561808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963481 + ... + 963492.

It is an arithmetic number, because the mean of its divisors is an integer number (2890461).

Almost surely, 2^11561838 is an apocalyptic number.

11561838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11561838 is a wasteful number, since it uses less digits than its factorization.

11561838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926978.

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

The square root of 11561838 is about 3400.2702833745. The cubic root of 11561838 is about 226.1217267862.

The spelling of 11561838 in words is "eleven million, five hundred sixty-one thousand, eight hundred thirty-eight".