1301866 has 4 divisors (see below), whose sum is σ = 1952802. Its totient is φ = 650932.

The previous prime is 1301863. The next prime is 1301879. The reversal of 1301866 is 6681031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6681031 = 7 ⋅954433.

It can be written as a sum of positive squares in only one way, i.e., 1274641 + 27225 = 1129^2 + 165^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1301866.

It is not an unprimeable number, because it can be changed into a prime (1301863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325465 + ... + 325468.

2^1301866 is an apocalyptic number.

1301866 is a deficient number, since it is larger than the sum of its proper divisors (650936).

1301866 is an equidigital number, since it uses as much as digits as its factorization.

1301866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650935.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1301866 is about 1140.9934267996. The cubic root of 1301866 is about 109.1914822930.

Adding to 1301866 its reverse (6681031), we get a palindrome (7982897).

The spelling of 1301866 in words is "one million, three hundred one thousand, eight hundred sixty-six".