1279959820 has 12 divisors (see below), whose sum is σ = 2687915664. Its totient is φ = 511983920.

The previous prime is 1279959799. The next prime is 1279959839. The reversal of 1279959820 is 289599721.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31998976 + ... + 31999015.

It is an arithmetic number, because the mean of its divisors is an integer number (223992972).

Almost surely, 2^1279959820 is an apocalyptic number.

1279959820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279959820 is an abundant number, since it is smaller than the sum of its proper divisors (1407955844).

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

1279959820 is a wasteful number, since it uses less digits than its factorization.

1279959820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63998000 (or 63997998 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 1279959820 is about 35776.5261030190. The cubic root of 1279959820 is about 1085.7556855504.

The spelling of 1279959820 in words is "one billion, two hundred seventy-nine million, nine hundred fifty-nine thousand, eight hundred twenty".