1256507 has 6 divisors (see below), whose sum is σ = 1461708. Its totient is φ = 1076964.

The previous prime is 1256477. The next prime is 1256531. The reversal of 1256507 is 7056521.

It is not a de Polignac number, because 1256507 - 2¹² = 1252411 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256587) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 12773 + ... + 12870.

It is an arithmetic number, because the mean of its divisors is an integer number (243618).

2^1256507 is an apocalyptic number.

1256507 is a deficient number, since it is larger than the sum of its proper divisors (205201).

1256507 is an equidigital number, since it uses as much as digits as its factorization.

1256507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25657 (or 25650 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 1256507 is about 1120.9402303424. The cubic root of 1256507 is about 107.9083298486.

The spelling of 1256507 in words is "one million, two hundred fifty-six thousand, five hundred seven".