1256667 has 4 divisors (see below), whose sum is σ = 1675560. Its totient is φ = 837776.

The previous prime is 1256659. The next prime is 1256681. The reversal of 1256667 is 7666521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1256667 - 2³ = 1256659 is a prime.

It is a D-number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1256617) 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, 209442 + ... + 209447.

It is an arithmetic number, because the mean of its divisors is an integer number (418890).

2^1256667 is an apocalyptic number.

1256667 is a deficient number, since it is larger than the sum of its proper divisors (418893).

1256667 is an equidigital number, since it uses as much as digits as its factorization.

1256667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418892.

The product of its digits is 15120, while the sum is 33.

The square root of 1256667 is about 1121.0115967286. The cubic root of 1256667 is about 107.9129099000.

The spelling of 1256667 in words is "one million, two hundred fifty-six thousand, six hundred sixty-seven".