1279297894400 has 144 divisors (see below), whose sum is σ = 3173225884920. Its totient is φ = 511502745600.

The previous prime is 1279297894397. The next prime is 1279297894411. The reversal of 1279297894400 is 44987929721.

It is a happy number.

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, 182831702 + ... + 182838698.

Almost surely, 2^{1279297894400} is an apocalyptic number.

1279297894400 is a gapful number since it is divisible by the number (10) 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 1279297894400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1586612942460).

1279297894400 is an abundant number, since it is smaller than the sum of its proper divisors (1893927990520).

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

1279297894400 is an equidigital number, since it uses as much as digits as its factorization.

1279297894400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600 (or 10575 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 1279297894400 in words is "one trillion, two hundred seventy-nine billion, two hundred ninety-seven million, eight hundred ninety-four thousand, four hundred".