340399 has 4 divisors (see below), whose sum is σ = 345136. Its totient is φ = 335664.

The previous prime is 340397. The next prime is 340409. The reversal of 340399 is 993043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993043 = 37 ⋅26839.

It is a cyclic number.

It is not a de Polignac number, because 340399 - 2¹ = 340397 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 (340393) 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 3 ways as a sum of consecutive naturals, for example, 2259 + ... + 2404.

It is an arithmetic number, because the mean of its divisors is an integer number (86284).

2³⁴⁰³⁹⁹ is an apocalyptic number.

340399 is a deficient number, since it is larger than the sum of its proper divisors (4737).

340399 is an equidigital number, since it uses as much as digits as its factorization.

340399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 340399 is about 583.4372288430. The cubic root of 340399 is about 69.8226120832.

The spelling of 340399 in words is "three hundred forty thousand, three hundred ninety-nine".