1256646 has 8 divisors (see below), whose sum is σ = 2513304. Its totient is φ = 418880.

The previous prime is 1256621. The next prime is 1256659. The reversal of 1256646 is 6466521.

1256646 = 559² + 560² + ... + 562².

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

1256646 is an admirable number.

It is a super-3 number, since 3×1256646³ = 5953332160452822408, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104715 + ... + 104726.

It is an arithmetic number, because the mean of its divisors is an integer number (314163).

2^1256646 is an apocalyptic number.

1256646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1256646 is a wasteful number, since it uses less digits than its factorization.

1256646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209446.

The product of its digits is 8640, while the sum is 30.

The square root of 1256646 is about 1121.0022301494. The cubic root of 1256646 is about 107.9123087905.

The spelling of 1256646 in words is "one million, two hundred fifty-six thousand, six hundred forty-six".