1285706 has 4 divisors (see below), whose sum is σ = 1928562. Its totient is φ = 642852.

The previous prime is 1285703. The next prime is 1285717. The reversal of 1285706 is 6075821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6075821 = 991 ⋅6131.

It can be written as a sum of positive squares in only one way, i.e., 919681 + 366025 = 959^2 + 605^2 .

It is not an unprimeable number, because it can be changed into a prime (1285703) 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 as a sum of consecutive naturals, namely, 321425 + ... + 321428.

2^1285706 is an apocalyptic number.

1285706 is a deficient number, since it is larger than the sum of its proper divisors (642856).

1285706 is an equidigital number, since it uses as much as digits as its factorization.

1285706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642855.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1285706 is about 1133.8897653652. The cubic root of 1285706 is about 108.7378037144.

It can be divided in two parts, 1285 and 706, that added together give a palindrome (1991).

The spelling of 1285706 in words is "one million, two hundred eighty-five thousand, seven hundred six".