320400123 has 4 divisors (see below), whose sum is σ = 427200168. Its totient is φ = 213600080.

The previous prime is 320400109. The next prime is 320400133. The reversal of 320400123 is 321004023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320400123 - 2¹³ = 320391931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320400103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53400018 + ... + 53400023.

It is an arithmetic number, because the mean of its divisors is an integer number (106800042).

Almost surely, 2^320400123 is an apocalyptic number.

320400123 is a deficient number, since it is larger than the sum of its proper divisors (106800045).

320400123 is a wasteful number, since it uses less digits than its factorization.

320400123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106800044.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320400123 is about 17899.7241040190. The cubic root of 320400123 is about 684.2753435592.

Adding to 320400123 its reverse (321004023), we get a palindrome (641404146).

The spelling of 320400123 in words is "three hundred twenty million, four hundred thousand, one hundred twenty-three".