1209878359290 has 96 divisors (see below), whose sum is σ = 3221600031936. Its totient is φ = 314860815360.

The previous prime is 1209878359237. The next prime is 1209878359307. The reversal of 1209878359290 is 929538789021.

1209878359290 is a `hidden beast` number, since 1 + 209 + 8 + 78 + 359 + 2 + 9 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4398282 + ... + 4665258.

It is an arithmetic number, because the mean of its divisors is an integer number (33558333666).

Almost surely, 2^{1209878359290} is an apocalyptic number.

1209878359290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209878359290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1610800015968).

1209878359290 is an abundant number, since it is smaller than the sum of its proper divisors (2011721672646).

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

1209878359290 is a wasteful number, since it uses less digits than its factorization.

1209878359290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268204 (or 268201 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 1209878359290 in words is "one trillion, two hundred nine billion, eight hundred seventy-eight million, three hundred fifty-nine thousand, two hundred ninety".