1279839960 has 512 divisors, whose sum is σ = 5190451200. Its totient is φ = 274337280.

The previous prime is 1279839941. The next prime is 1279839961. The reversal of 1279839960 is 699389721.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1279839897 and 1279839906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279839961) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10077417 + ... + 10077543.

It is an arithmetic number, because the mean of its divisors is an integer number (10137600).

Almost surely, 2^1279839960 is an apocalyptic number.

1279839960 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 1279839960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2595225600).

1279839960 is an abundant number, since it is smaller than the sum of its proper divisors (3910611240).

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

1279839960 is a wasteful number, since it uses less digits than its factorization.

1279839960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 1279839960 is about 35774.8509430857. The cubic root of 1279839960 is about 1085.7217931482.

The spelling of 1279839960 in words is "one billion, two hundred seventy-nine million, eight hundred thirty-nine thousand, nine hundred sixty".