340645 has 8 divisors (see below), whose sum is σ = 412056. Its totient is φ = 270336.

The previous prime is 340643. The next prime is 340649. The reversal of 340645 is 546043.

340645 = T₂₅₆ + T₂₅₇ + ... + T₂₆₅.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 334084 = 81^2 + 578^2 .

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 340645 - 2¹ = 340643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (51507).

2³⁴⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

340645 is a deficient number, since it is larger than the sum of its proper divisors (71411).

340645 is a wasteful number, since it uses less digits than its factorization.

340645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 340645 is about 583.6480103624. The cubic root of 340645 is about 69.8394278656.

Adding to 340645 its reverse (546043), we get a palindrome (886688).

The spelling of 340645 in words is "three hundred forty thousand, six hundred forty-five".