1287106 has 4 divisors (see below), whose sum is σ = 1930662. Its totient is φ = 643552.

The previous prime is 1287101. The next prime is 1287109. The reversal of 1287106 is 6017821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6017821 = 613 ⋅9817.

It can be written as a sum of positive squares in only one way, i.e., 1134225 + 152881 = 1065^2 + 391^2 .

It is not an unprimeable number, because it can be changed into a prime (1287101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321775 + ... + 321778.

2^1287106 is an apocalyptic number.

1287106 is a deficient number, since it is larger than the sum of its proper divisors (643556).

1287106 is an equidigital number, since it uses as much as digits as its factorization.

1287106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643555.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1287106 is about 1134.5069413626. The cubic root of 1287106 is about 108.7772574473. Note that the first 3 decimals are identical.

The spelling of 1287106 in words is "one million, two hundred eighty-seven thousand, one hundred six".