11138391 has 32 divisors (see below), whose sum is σ = 18263040. Its totient is φ = 6735960.

The previous prime is 11138377. The next prime is 11138423. The reversal of 11138391 is 19383111.

It is a happy number.

It is not a de Polignac number, because 11138391 - 2⁵ = 11138359 is a prime.

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 (11138311) 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, 23826 + ... + 24288.

It is an arithmetic number, because the mean of its divisors is an integer number (570720).

Almost surely, 2^11138391 is an apocalyptic number.

11138391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11138391 is a deficient number, since it is larger than the sum of its proper divisors (7124649).

11138391 is an frugal number, since it uses more digits than its factorization.

11138391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 477 counting only the distinct ones).

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

The square root of 11138391 is about 3337.4228080961. The cubic root of 11138391 is about 223.3267880065.

The spelling of 11138391 in words is "eleven million, one hundred thirty-eight thousand, three hundred ninety-one".