1256013 has 16 divisors (see below), whose sum is σ = 2030400. Its totient is φ = 761040.

The previous prime is 1256009. The next prime is 1256023. The reversal of 1256013 is 3106521.

It is not a de Polignac number, because 1256013 - 2² = 1256009 is a prime.

1256013 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256023) 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, 1818 + ... + 2411.

It is an arithmetic number, because the mean of its divisors is an integer number (126900).

2^1256013 is an apocalyptic number.

It is an amenable number.

1256013 is a deficient number, since it is larger than the sum of its proper divisors (774387).

1256013 is a wasteful number, since it uses less digits than its factorization.

1256013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249 (or 4243 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1256013 is about 1120.7198579485. The cubic root of 1256013 is about 107.8941864860.

The spelling of 1256013 in words is "one million, two hundred fifty-six thousand, thirteen".