1209120660 has 72 divisors (see below), whose sum is σ = 4001096736. Its totient is φ = 293119680.

The previous prime is 1209120629. The next prime is 1209120667. The reversal of 1209120660 is 660219021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209120667) 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 23 ways as a sum of consecutive naturals, for example, 303354 + ... + 307313.

It is an arithmetic number, because the mean of its divisors is an integer number (55570788).

Almost surely, 2^1209120660 is an apocalyptic number.

1209120660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209120660 is an abundant number, since it is smaller than the sum of its proper divisors (2791976076).

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

1209120660 is a wasteful number, since it uses less digits than its factorization.

1209120660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610693 (or 610688 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1209120660 is about 34772.4123408198. The cubic root of 1209120660 is about 1065.3440401412.

Adding to 1209120660 its reverse (660219021), we get a palindrome (1869339681).

The spelling of 1209120660 in words is "one billion, two hundred nine million, one hundred twenty thousand, six hundred sixty".