1279650821904 has 360 divisors, whose sum is σ = 4581865491840. Its totient is φ = 330308568576.

The previous prime is 1279650821887. The next prime is 1279650821909. The reversal of 1279650821904 is 4091280569721.

It is a happy number.

1279650821904 is a `hidden beast` number, since 1 + 27 + 9 + 6 + 508 + 21 + 90 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1279650821909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4162807 + ... + 4459625.

It is an arithmetic number, because the mean of its divisors is an integer number (12727404144).

Almost surely, 2^{1279650821904} is an apocalyptic number.

1279650821904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279650821904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2290932745920).

1279650821904 is an abundant number, since it is smaller than the sum of its proper divisors (3302214669936).

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

1279650821904 is a wasteful number, since it uses less digits than its factorization.

1279650821904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296907 (or 296891 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 1279650821904 in words is "one trillion, two hundred seventy-nine billion, six hundred fifty million, eight hundred twenty-one thousand, nine hundred four".