1315665 has 36 divisors (see below), whose sum is σ = 2483676. Its totient is φ = 643968.

The previous prime is 1315661. The next prime is 1315673. The reversal of 1315665 is 5665131.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 63504 + 1252161 = 252^2 + 1119^2 .

It is not a de Polignac number, because 1315665 - 2² = 1315661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1315661) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7519 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (68991).

2^1315665 is an apocalyptic number.

1315665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1315665 is a deficient number, since it is larger than the sum of its proper divisors (1168011).

1315665 is a wasteful number, since it uses less digits than its factorization.

1315665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 194 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1315665 is about 1147.0244112485. The cubic root of 1315665 is about 109.5759153304.

The spelling of 1315665 in words is "one million, three hundred fifteen thousand, six hundred sixty-five".