1279191120 has 80 divisors (see below), whose sum is σ = 3979245312. Its totient is φ = 339934720.

The previous prime is 1279191119. The next prime is 1279191143. The reversal of 1279191120 is 211919721.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61225 + ... + 79415.

Almost surely, 2^1279191120 is an apocalyptic number.

1279191120 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 1279191120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989622656).

1279191120 is an abundant number, since it is smaller than the sum of its proper divisors (2700054192).

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

1279191120 is a wasteful number, since it uses less digits than its factorization.

1279191120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18500 (or 18494 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 33.

The square root of 1279191120 is about 35765.7814118467. The cubic root of 1279191120 is about 1085.5382861394.

The spelling of 1279191120 in words is "one billion, two hundred seventy-nine million, one hundred ninety-one thousand, one hundred twenty".