1286816 has 12 divisors (see below), whose sum is σ = 2533482. Its totient is φ = 643392.

The previous prime is 1286807. The next prime is 1286819. The reversal of 1286816 is 6186821.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 163216 = 1060^2 + 404^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 40213 = 1286816 / (1 + 2 + 8 + 6 + 8 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (1286819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20075 + ... + 20138.

2^1286816 is an apocalyptic number.

1286816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1286816 is a deficient number, since it is larger than the sum of its proper divisors (1246666).

1286816 is an equidigital number, since it uses as much as digits as its factorization.

1286816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40223 (or 40215 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 1286816 is about 1134.3791253369. The cubic root of 1286816 is about 108.7690872385.

The spelling of 1286816 in words is "one million, two hundred eighty-six thousand, eight hundred sixteen".