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1286 = 2643
BaseRepresentation
bin10100000110
31202122
4110012
520121
65542
73515
oct2406
91678
101286
11a6a
128b2
1377c
1467c
155ab
hex506

1286 has 4 divisors (see below), whose sum is σ = 1932. Its totient is φ = 642.

The previous prime is 1283. The next prime is 1289. The reversal of 1286 is 6821.

1286 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6821 = 19359.

It is an interprime number because it is at equal distance from previous prime (1283) and next prime (1289).

1286 is an undulating number in base 11.

It is a plaindrome in base 9, base 13, base 14 and base 15.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320 + ... + 323.

It is an arithmetic number, because the mean of its divisors is an integer number (483).

21286 is an apocalyptic number.

1286 is a deficient number, since it is larger than the sum of its proper divisors (646).

1286 is an equidigital number, since it uses as much as digits as its factorization.

1286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645.

The product of its digits is 96, while the sum is 17.

The square root of 1286 is about 35.8608421541. The cubic root of 1286 is about 10.8746091373.

The spelling of 1286 in words is "one thousand, two hundred eighty-six".

Divisors: 1 2 643 1286