1256487 has 16 divisors (see below), whose sum is σ = 1804032. Its totient is φ = 775040.

The previous prime is 1256477. The next prime is 1256531. The reversal of 1256487 is 7846521.

It is a cyclic number.

It is not a de Polignac number, because 1256487 - 2⁸ = 1256231 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3448 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (112752).

2^1256487 is an apocalyptic number.

1256487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1256487 is a deficient number, since it is larger than the sum of its proper divisors (547545).

1256487 is a wasteful number, since it uses less digits than its factorization.

1256487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its digits is 13440, while the sum is 33.

The square root of 1256487 is about 1120.9313092246. The cubic root of 1256487 is about 107.9077573149.

The spelling of 1256487 in words is "one million, two hundred fifty-six thousand, four hundred eighty-seven".