11989220 has 24 divisors (see below), whose sum is σ = 25793208. Its totient is φ = 4678400.

The previous prime is 11989193. The next prime is 11989253. The reversal of 11989220 is 2298911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1387684 + 10601536 = 1178^2 + 3256^2 .

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 7 ways as a sum of consecutive naturals, for example, 6491 + ... + 8130.

It is an arithmetic number, because the mean of its divisors is an integer number (1074717).

Almost surely, 2^11989220 is an apocalyptic number.

11989220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11989220 is an abundant number, since it is smaller than the sum of its proper divisors (13803988).

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

11989220 is a wasteful number, since it uses less digits than its factorization.

11989220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14671 (or 14669 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11989220 is about 3462.5453065628. The cubic root of 11989220 is about 228.8742723077.

The spelling of 11989220 in words is "eleven million, nine hundred eighty-nine thousand, two hundred twenty".