1340645 has 8 divisors (see below), whose sum is σ = 1631256. Its totient is φ = 1057536.

The previous prime is 1340639. The next prime is 1340653. The reversal of 1340645 is 5460431.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11236 + 1329409 = 106^2 + 1153^2 .

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 1340645 - 2¹⁴ = 1324261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472 + ... + 2201.

It is an arithmetic number, because the mean of its divisors is an integer number (203907).

2^1340645 is an apocalyptic number.

It is an amenable number.

1340645 is a deficient number, since it is larger than the sum of its proper divisors (290611).

1340645 is an equidigital number, since it uses as much as digits as its factorization.

1340645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1340645 is about 1157.8622543291. The cubic root of 1340645 is about 110.2650632524.

The spelling of 1340645 in words is "one million, three hundred forty thousand, six hundred forty-five".