11689780 has 24 divisors (see below), whose sum is σ = 25213608. Its totient is φ = 4549248.

The previous prime is 11689771. The next prime is 11689781. The reversal of 11689780 is 8798611.

It can be written as a sum of positive squares in 4 ways, for example, as 4485924 + 7203856 = 2118^2 + 2684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11689781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7159 + ... + 8638.

It is an arithmetic number, because the mean of its divisors is an integer number (1050567).

Almost surely, 2^11689780 is an apocalyptic number.

11689780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11689780 is an abundant number, since it is smaller than the sum of its proper divisors (13523828).

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

11689780 is a wasteful number, since it uses less digits than its factorization.

11689780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15843 (or 15841 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 11689780 is about 3419.0320267585. The cubic root of 11689780 is about 226.9527481587.

The spelling of 11689780 in words is "eleven million, six hundred eighty-nine thousand, seven hundred eighty".