1256406 has 8 divisors (see below), whose sum is σ = 2512824. Its totient is φ = 418800.

The previous prime is 1256393. The next prime is 1256407. The reversal of 1256406 is 6046521.

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

1256406 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256407) 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, 104695 + ... + 104706.

It is an arithmetic number, because the mean of its divisors is an integer number (314103).

2^1256406 is an apocalyptic number.

1256406 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.

1256406 is a wasteful number, since it uses less digits than its factorization.

1256406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209406.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1256406 is about 1120.8951779716. The cubic root of 1256406 is about 107.9054384910.

The spelling of 1256406 in words is "one million, two hundred fifty-six thousand, four hundred six".