11391138 has 64 divisors (see below), whose sum is σ = 28016640. Its totient is φ = 3402000.

The previous prime is 11391119. The next prime is 11391151. The reversal of 11391138 is 83119311.

It is a happy number.

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

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 31 ways as a sum of consecutive naturals, for example, 75363 + ... + 75513.

It is an arithmetic number, because the mean of its divisors is an integer number (437760).

Almost surely, 2^11391138 is an apocalyptic number.

11391138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11391138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14008320).

11391138 is an abundant number, since it is smaller than the sum of its proper divisors (16625502).

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

11391138 is a wasteful number, since it uses less digits than its factorization.

With its successor (11391139) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (294).

11391138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 11391138 is about 3375.0759991443. The cubic root of 11391138 is about 225.0033777271.

The spelling of 11391138 in words is "eleven million, three hundred ninety-one thousand, one hundred thirty-eight".