1266858 has 12 divisors (see below), whose sum is σ = 2744898. Its totient is φ = 422280.

The previous prime is 1266851. The next prime is 1266869. The reversal of 1266858 is 8586621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1159929 + 106929 = 1077^2 + 327^2 .

It is not an unprimeable number, because it can be changed into a prime (1266851) 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, 35173 + ... + 35208.

2^1266858 is an apocalyptic number.

1266858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1266858 is an abundant number, since it is smaller than the sum of its proper divisors (1478040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266858 is a wasteful number, since it uses less digits than its factorization.

1266858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70389 (or 70386 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1266858 is about 1125.5478665965. The cubic root of 1266858 is about 108.2038331617.

The spelling of 1266858 in words is "one million, two hundred sixty-six thousand, eight hundred fifty-eight".