1340665 has 4 divisors (see below), whose sum is σ = 1608804. Its totient is φ = 1072528.

The previous prime is 1340653. The next prime is 1340681. The reversal of 1340665 is 5660431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 769129 + 571536 = 877^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340665 - 2⁹ = 1340153 is a prime.

It is a Duffinian number.

1340665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134062 + ... + 134071.

It is an arithmetic number, because the mean of its divisors is an integer number (402201).

2^1340665 is an apocalyptic number.

It is an amenable number.

1340665 is a deficient number, since it is larger than the sum of its proper divisors (268139).

1340665 is an equidigital number, since it uses as much as digits as its factorization.

1340665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268138.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1340665 is about 1157.8708909028. The cubic root of 1340665 is about 110.2656115682.

The spelling of 1340665 in words is "one million, three hundred forty thousand, six hundred sixty-five".