11213780 has 12 divisors (see below), whose sum is σ = 23548980. Its totient is φ = 4485504.

The previous prime is 11213773. The next prime is 11213809. The reversal of 11213780 is 8731211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 8213956 = 1732^2 + 2866^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280325 + ... + 280364.

It is an arithmetic number, because the mean of its divisors is an integer number (1962415).

Almost surely, 2^11213780 is an apocalyptic number.

11213780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11213780 is an abundant number, since it is smaller than the sum of its proper divisors (12335200).

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

11213780 is a wasteful number, since it uses less digits than its factorization.

11213780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560698 (or 560696 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 11213780 is about 3348.6982545461. The cubic root of 11213780 is about 223.8295099385.

Adding to 11213780 its reverse (8731211), we get a palindrome (19944991).

The spelling of 11213780 in words is "eleven million, two hundred thirteen thousand, seven hundred eighty".