1256630 has 16 divisors (see below), whose sum is σ = 2305584. Its totient is φ = 492960.

The previous prime is 1256621. The next prime is 1256659. The reversal of 1256630 is 366521.

It is a junction number, because it is equal to n+sod(n) for n = 1256596 and 1256605.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 656 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (144099).

2^1256630 is an apocalyptic number.

1256630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256630 is a deficient number, since it is larger than the sum of its proper divisors (1048954).

1256630 is a wasteful number, since it uses less digits than its factorization.

1256630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1256630 is about 1120.9950936556. The cubic root of 1256630 is about 107.9118507977.

The spelling of 1256630 in words is "one million, two hundred fifty-six thousand, six hundred thirty".