1256945 has 16 divisors (see below), whose sum is σ = 1615680. Its totient is φ = 936000.

The previous prime is 1256939. The next prime is 1256953. The reversal of 1256945 is 5496521.

It is a happy number.

It is not a de Polignac number, because 1256945 - 2¹⁶ = 1191409 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9530 + ... + 9660.

It is an arithmetic number, because the mean of its divisors is an integer number (100980).

2^1256945 is an apocalyptic number.

It is an amenable number.

1256945 is a deficient number, since it is larger than the sum of its proper divisors (358735).

1256945 is a wasteful number, since it uses less digits than its factorization.

1256945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its digits is 10800, while the sum is 32.

The square root of 1256945 is about 1121.1355850208. The cubic root of 1256945 is about 107.9208668149.

The spelling of 1256945 in words is "one million, two hundred fifty-six thousand, nine hundred forty-five".