1258866 has 48 divisors (see below), whose sum is σ = 3179904. Its totient is φ = 352512.

The previous prime is 1258847. The next prime is 1258871. The reversal of 1258866 is 6688521.

It is a happy number.

1258866 is a `hidden beast` number, since 12 + 588 + 66 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1258866.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 12171 + ... + 12273.

It is an arithmetic number, because the mean of its divisors is an integer number (66248).

2^1258866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1258866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589952).

1258866 is an abundant number, since it is smaller than the sum of its proper divisors (1921038).

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

1258866 is a wasteful number, since it uses less digits than its factorization.

1258866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 212 counting only the distinct ones).

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

The square root of 1258866 is about 1121.9919785810. The cubic root of 1258866 is about 107.9758176310.

The spelling of 1258866 in words is "one million, two hundred fifty-eight thousand, eight hundred sixty-six".