11138815 has 4 divisors (see below), whose sum is σ = 13366584. Its totient is φ = 8911048.

The previous prime is 11138767. The next prime is 11138821. The reversal of 11138815 is 51883111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11138815 - 2¹⁵ = 11106047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113877 + ... + 1113886.

It is an arithmetic number, because the mean of its divisors is an integer number (3341646).

Almost surely, 2^11138815 is an apocalyptic number.

11138815 is a deficient number, since it is larger than the sum of its proper divisors (2227769).

11138815 is an equidigital number, since it uses as much as digits as its factorization.

11138815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227768.

The product of its digits is 960, while the sum is 28.

The square root of 11138815 is about 3337.4863295600. The cubic root of 11138815 is about 223.3296217299.

The spelling of 11138815 in words is "eleven million, one hundred thirty-eight thousand, eight hundred fifteen".