1188815 has 4 divisors (see below), whose sum is σ = 1426584. Its totient is φ = 951048.

The previous prime is 1188787. The next prime is 1188839. The reversal of 1188815 is 5188811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5188811 = 31 ⋅167381.

It is a cyclic number.

It is not a de Polignac number, because 1188815 - 2⁸ = 1188559 is a prime.

It is a super-2 number, since 2×1188815² = 2826562208450, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 118877 + ... + 118886.

It is an arithmetic number, because the mean of its divisors is an integer number (356646).

2^1188815 is an apocalyptic number.

1188815 is a deficient number, since it is larger than the sum of its proper divisors (237769).

1188815 is an equidigital number, since it uses as much as digits as its factorization.

1188815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237768.

The product of its digits is 2560, while the sum is 32.

The square root of 1188815 is about 1090.3279323213. The cubic root of 1188815 is about 105.9346636641.

The spelling of 1188815 in words is "one million, one hundred eighty-eight thousand, eight hundred fifteen".