1279942800 has 60 divisors (see below), whose sum is σ = 4100087280. Its totient is φ = 341317760.

The previous prime is 1279942777. The next prime is 1279942823. The reversal of 1279942800 is 82499721.

It is an interprime number because it is at equal distance from previous prime (1279942777) and next prime (1279942823).

It is a tau number, because it is divible by the number of its divisors (60).

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, 532110 + ... + 534509.

It is an arithmetic number, because the mean of its divisors is an integer number (68334788).

Almost surely, 2^1279942800 is an apocalyptic number.

1279942800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279942800 is an abundant number, since it is smaller than the sum of its proper divisors (2820144480).

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

1279942800 is a wasteful number, since it uses less digits than its factorization.

1279942800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066640 (or 1066629 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1279942800 is about 35776.2882367637. The cubic root of 1279942800 is about 1085.7508729921.

The spelling of 1279942800 in words is "one billion, two hundred seventy-nine million, nine hundred forty-two thousand, eight hundred".