1266418 has 4 divisors (see below), whose sum is σ = 1899630. Its totient is φ = 633208.

The previous prime is 1266413. The next prime is 1266431. The reversal of 1266418 is 8146621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 157609 = 1053^2 + 397^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1266413) 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, 316603 + ... + 316606.

2^1266418 is an apocalyptic number.

1266418 is a deficient number, since it is larger than the sum of its proper divisors (633212).

1266418 is an equidigital number, since it uses as much as digits as its factorization.

1266418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633211.

The product of its digits is 2304, while the sum is 28.

The square root of 1266418 is about 1125.3523892541. The cubic root of 1266418 is about 108.1913047384.

It can be divided in two parts, 12 and 66418, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 1266418 in words is "one million, two hundred sixty-six thousand, four hundred eighteen".