1279980 has 72 divisors (see below), whose sum is σ = 4188912. Its totient is φ = 314496.

The previous prime is 1279969. The next prime is 1279997. The reversal of 1279980 is 899721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2067 + ... + 2613.

2^1279980 is an apocalyptic number.

1279980 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 1279980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2094456).

1279980 is an abundant number, since it is smaller than the sum of its proper divisors (2908932).

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

1279980 is a wasteful number, since it uses less digits than its factorization.

1279980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1279980 is about 1131.3620110292. The cubic root of 1279980 is about 108.5761391572.

The spelling of 1279980 in words is "one million, two hundred seventy-nine thousand, nine hundred eighty".