340813 has 4 divisors (see below), whose sum is σ = 371808. Its totient is φ = 309820.

The previous prime is 340811. The next prime is 340819. The reversal of 340813 is 318043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 340813 - 2¹ = 340811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15481 + ... + 15502.

It is an arithmetic number, because the mean of its divisors is an integer number (92952).

2³⁴⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

340813 is a deficient number, since it is larger than the sum of its proper divisors (30995).

340813 is a wasteful number, since it uses less digits than its factorization.

340813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30994.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 340813 is about 583.7919149834. The cubic root of 340813 is about 69.8509071628.

Adding to 340813 its reverse (318043), we get a palindrome (658856).

The spelling of 340813 in words is "three hundred forty thousand, eight hundred thirteen".