340320405 has 16 divisors (see below), whose sum is σ = 549334080. Its totient is φ = 179897088.

The previous prime is 340320391. The next prime is 340320439. The reversal of 340320405 is 504023043.

It is a happy number.

It is not a de Polignac number, because 340320405 - 2⁹ = 340319893 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 98695 + ... + 102084.

It is an arithmetic number, because the mean of its divisors is an integer number (34333380).

Almost surely, 2^340320405 is an apocalyptic number.

It is an amenable number.

340320405 is a deficient number, since it is larger than the sum of its proper divisors (209013675).

340320405 is a wasteful number, since it uses less digits than its factorization.

340320405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200900.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 340320405 is about 18447.7750690971. The cubic root of 340320405 is about 698.1723786976.

Adding to 340320405 its reverse (504023043), we get a palindrome (844343448).

It can be divided in two parts, 340320 and 405, that added together give a triangular number (340725 = T₈₂₅).

The spelling of 340320405 in words is "three hundred forty million, three hundred twenty thousand, four hundred five".