1266778 has 8 divisors (see below), whose sum is σ = 1965780. Its totient is φ = 611520.

The previous prime is 1266767. The next prime is 1266779. The reversal of 1266778 is 8776621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1096209 + 170569 = 1047^2 + 413^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10863 + ... + 10978.

2^1266778 is an apocalyptic number.

1266778 is a deficient number, since it is larger than the sum of its proper divisors (699002).

1266778 is a wasteful number, since it uses less digits than its factorization.

1266778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872.

The product of its digits is 28224, while the sum is 37.

The square root of 1266778 is about 1125.5123277868. The cubic root of 1266778 is about 108.2015554823.

The spelling of 1266778 in words is "one million, two hundred sixty-six thousand, seven hundred seventy-eight".