1279880 has 48 divisors (see below), whose sum is σ = 3355020. Its totient is φ = 438144.

The previous prime is 1279877. The next prime is 1279907. The reversal of 1279880 is 889721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1223236 + 56644 = 1106^2 + 238^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1279880.

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, 1634 + ... + 2286.

2^1279880 is an apocalyptic number.

1279880 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 1279880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1677510).

1279880 is an abundant number, since it is smaller than the sum of its proper divisors (2075140).

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

1279880 is a wasteful number, since it uses less digits than its factorization.

1279880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1279880 is about 1131.3178156469. The cubic root of 1279880 is about 108.5733115357.

The spelling of 1279880 in words is "one million, two hundred seventy-nine thousand, eight hundred eighty".