11855618 has 4 divisors (see below), whose sum is σ = 17783430. Its totient is φ = 5927808.

The previous prime is 11855593. The next prime is 11855633. The reversal of 11855618 is 81655811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81655811 = 17 ⋅4803283.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 1369 = 3443^2 + 37^2 .

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 as a sum of consecutive naturals, namely, 2963903 + ... + 2963906.

Almost surely, 2^11855618 is an apocalyptic number.

11855618 is a deficient number, since it is larger than the sum of its proper divisors (5927812).

11855618 is an equidigital number, since it uses as much as digits as its factorization.

11855618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927811.

The product of its digits is 9600, while the sum is 35.

The square root of 11855618 is about 3443.1988034385. The cubic root of 11855618 is about 228.0209404179.

The spelling of 11855618 in words is "eleven million, eight hundred fifty-five thousand, six hundred eighteen".