1265866 has 12 divisors (see below), whose sum is σ = 2208978. Its totient is φ = 542472.

The previous prime is 1265863. The next prime is 1265867. The reversal of 1265866 is 6685621.

It can be written as a sum of positive squares in only one way, i.e., 1058841 + 207025 = 1029^2 + 455^2 .

It is not an unprimeable number, because it can be changed into a prime (1265861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6361 + ... + 6556.

2^1265866 is an apocalyptic number.

1265866 is a deficient number, since it is larger than the sum of its proper divisors (943112).

1265866 is a wasteful number, since it uses less digits than its factorization.

1265866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12933 (or 12926 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1265866 is about 1125.1071060126. The cubic root of 1265866 is about 108.1755831575.

The spelling of 1265866 in words is "one million, two hundred sixty-five thousand, eight hundred sixty-six".