1256489 has 8 divisors (see below), whose sum is σ = 1424640. Its totient is φ = 1098576.

The previous prime is 1256477. The next prime is 1256531. The reversal of 1256489 is 9846521.

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 1256489 - 2¹⁶ = 1190953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256429) 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, 2297 + ... + 2790.

It is an arithmetic number, because the mean of its divisors is an integer number (178080).

2^1256489 is an apocalyptic number.

1256489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1256489 is a deficient number, since it is larger than the sum of its proper divisors (168151).

1256489 is a wasteful number, since it uses less digits than its factorization.

1256489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119.

The product of its digits is 17280, while the sum is 35.

The square root of 1256489 is about 1120.9322013396. The cubic root of 1256489 is about 107.9078145685.

The spelling of 1256489 in words is "one million, two hundred fifty-six thousand, four hundred eighty-nine".