11681439 has 32 divisors (see below), whose sum is σ = 19760640. Its totient is φ = 5961600.

The previous prime is 11681437. The next prime is 11681443. The reversal of 11681439 is 93418611.

It is not a de Polignac number, because 11681439 - 2¹ = 11681437 is a prime.

It is a super-5 number, since 5×11681439⁵ (a number of 37 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13677 + ... + 14505.

It is an arithmetic number, because the mean of its divisors is an integer number (617520).

Almost surely, 2^11681439 is an apocalyptic number.

11681439 is a deficient number, since it is larger than the sum of its proper divisors (8079201).

11681439 is a wasteful number, since it uses less digits than its factorization.

11681439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its digits is 5184, while the sum is 33.

The square root of 11681439 is about 3417.8120194066. The cubic root of 11681439 is about 226.8987561734.

The spelling of 11681439 in words is "eleven million, six hundred eighty-one thousand, four hundred thirty-nine".