1286980 has 24 divisors (see below), whose sum is σ = 2724120. Its totient is φ = 510720.

The previous prime is 1286969. The next prime is 1286981. The reversal of 1286980 is 896821.

It can be written as a sum of positive squares in 4 ways, for example, as 498436 + 788544 = 706^2 + 888^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1286981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4440 + ... + 4720.

It is an arithmetic number, because the mean of its divisors is an integer number (113505).

2^1286980 is an apocalyptic number.

1286980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286980 is an abundant number, since it is smaller than the sum of its proper divisors (1437140).

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

1286980 is a wasteful number, since it uses less digits than its factorization.

1286980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1286980 is about 1134.4514092723. The cubic root of 1286980 is about 108.7737077832.

The spelling of 1286980 in words is "one million, two hundred eighty-six thousand, nine hundred eighty".