1256065 has 8 divisors (see below), whose sum is σ = 1515240. Its totient is φ = 999552.

The previous prime is 1256063. The next prime is 1256107. The reversal of 1256065 is 5606521.

It can be written as a sum of positive squares in 4 ways, for example, as 258064 + 998001 = 508^2 + 999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256065 - 2¹ = 1256063 is a prime.

1256065 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (189405).

2^1256065 is an apocalyptic number.

It is an amenable number.

1256065 is a deficient number, since it is larger than the sum of its proper divisors (259175).

1256065 is a wasteful number, since it uses less digits than its factorization.

1256065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1256065 is about 1120.7430570831. The cubic root of 1256065 is about 107.8956754356.

The spelling of 1256065 in words is "one million, two hundred fifty-six thousand, sixty-five".