1209456660 has 48 divisors (see below), whose sum is σ = 3389400000. Its totient is φ = 322243584.

The previous prime is 1209456643. The next prime is 1209456673. The reversal of 1209456660 is 666549021.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 66871 + ... + 83009.

It is an arithmetic number, because the mean of its divisors is an integer number (70612500).

Almost surely, 2^1209456660 is an apocalyptic number.

1209456660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209456660 is an abundant number, since it is smaller than the sum of its proper divisors (2179943340).

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

1209456660 is a wasteful number, since it uses less digits than its factorization.

1209456660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17400 (or 17398 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1209456660 is about 34777.2434215249. The cubic root of 1209456660 is about 1065.4427130742.

The spelling of 1209456660 in words is "one billion, two hundred nine million, four hundred fifty-six thousand, six hundred sixty".