1315865 has 8 divisors (see below), whose sum is σ = 1597320. Its totient is φ = 1040512.

The previous prime is 1315861. The next prime is 1315871. The reversal of 1315865 is 5685131.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 1315609 = 16^2 + 1147^2 .

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 1315865 - 2² = 1315861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1315861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (199665).

2^1315865 is an apocalyptic number.

It is an amenable number.

1315865 is a deficient number, since it is larger than the sum of its proper divisors (281455).

1315865 is an equidigital number, since it uses as much as digits as its factorization.

1315865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051.

The product of its digits is 3600, while the sum is 29.

The square root of 1315865 is about 1147.1115900382. Note that the first 3 decimals coincide. The cubic root of 1315865 is about 109.5814674207.

The spelling of 1315865 in words is "one million, three hundred fifteen thousand, eight hundred sixty-five".