1256889 has 8 divisors (see below), whose sum is σ = 1733760. Its totient is φ = 808976.

The previous prime is 1256887. The next prime is 1256891. The reversal of 1256889 is 9886521.

It is an interprime number because it is at equal distance from previous prime (1256887) and next prime (1256891).

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

It is a cyclic number.

It is not a de Polignac number, because 1256889 - 2¹ = 1256887 is a prime.

It is an Ulam number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1256887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7137 + ... + 7310.

It is an arithmetic number, because the mean of its divisors is an integer number (216720).

2^1256889 is an apocalyptic number.

It is an amenable number.

1256889 is a deficient number, since it is larger than the sum of its proper divisors (476871).

1256889 is a wasteful number, since it uses less digits than its factorization.

1256889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14479.

The product of its digits is 34560, while the sum is 39.

The square root of 1256889 is about 1121.1106100649. The cubic root of 1256889 is about 107.9192640775.

It can be divided in two parts, 1256 and 889, that added together give a triangular number (2145 = T₆₅).

The spelling of 1256889 in words is "one million, two hundred fifty-six thousand, eight hundred eighty-nine".