1340385 has 16 divisors (see below), whose sum is σ = 2160384. Its totient is φ = 709632.

The previous prime is 1340369. The next prime is 1340387. The reversal of 1340385 is 5830431.

It is not a de Polignac number, because 1340385 - 2⁴ = 1340369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1340387) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2664 + ... + 3126.

It is an arithmetic number, because the mean of its divisors is an integer number (135024).

2^1340385 is an apocalyptic number.

1340385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1340385 is a deficient number, since it is larger than the sum of its proper divisors (819999).

1340385 is a wasteful number, since it uses less digits than its factorization.

1340385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1340385 is about 1157.7499730080. The cubic root of 1340385 is about 110.2579346514.

The spelling of 1340385 in words is "one million, three hundred forty thousand, three hundred eighty-five".