11287818 has 12 divisors (see below), whose sum is σ = 24456978. Its totient is φ = 3762600.

The previous prime is 11287811. The next prime is 11287831. The reversal of 11287818 is 81878211.

It can be written as a sum of positive squares in only one way, i.e., 11108889 + 178929 = 3333^2 + 423^2 .

It is a super-2 number, since 2×11287818² = 254829670402248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11287811) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 313533 + ... + 313568.

Almost surely, 2^11287818 is an apocalyptic number.

11287818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11287818 is an abundant number, since it is smaller than the sum of its proper divisors (13169160).

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

11287818 is a wasteful number, since it uses less digits than its factorization.

11287818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627109 (or 627106 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 11287818 is about 3359.7348109635. The cubic root of 11287818 is about 224.3210346806.

It can be divided in two parts, 112878 and 18, that added together give a square (112896 = 336²).

The spelling of 11287818 in words is "eleven million, two hundred eighty-seven thousand, eight hundred eighteen".