1286780 has 24 divisors (see below), whose sum is σ = 2948400. Its totient is φ = 467840.

The previous prime is 1286777. The next prime is 1286783. The reversal of 1286780 is 876821.

It is an interprime number because it is at equal distance from previous prime (1286777) and next prime (1286783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 3144.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^1286780 is an apocalyptic number.

1286780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286780 is an abundant number, since it is smaller than the sum of its proper divisors (1661620).

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

1286780 is a wasteful number, since it uses less digits than its factorization.

1286780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869 (or 5867 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1286780 is about 1134.3632575150. The cubic root of 1286780 is about 108.7680729201.

The spelling of 1286780 in words is "one million, two hundred eighty-six thousand, seven hundred eighty".