1209909899376 has 60 divisors (see below), whose sum is σ = 3387024961320. Its totient is φ = 403189234560.

The previous prime is 1209909899281. The next prime is 1209909899381. The reversal of 1209909899376 is 6739989099021.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676506 + ... + 1696313.

It is an arithmetic number, because the mean of its divisors is an integer number (56450416022).

Almost surely, 2^{1209909899376} is an apocalyptic number.

1209909899376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1209909899376 is an abundant number, since it is smaller than the sum of its proper divisors (2177115061944).

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

1209909899376 is a wasteful number, since it uses less digits than its factorization.

1209909899376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376374 (or 2376365 counting only the distinct ones).

The product of its (nonzero) digits is 119042784, while the sum is 72.

The spelling of 1209909899376 in words is "one trillion, two hundred nine billion, nine hundred nine million, eight hundred ninety-nine thousand, three hundred seventy-six".