320990123 has 4 divisors (see below), whose sum is σ = 337884360. Its totient is φ = 304095888.

The previous prime is 320990081. The next prime is 320990147. The reversal of 320990123 is 321099023.

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 320990123 - 2¹⁶ = 320924587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320990023) 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, 8447090 + ... + 8447127.

It is an arithmetic number, because the mean of its divisors is an integer number (84471090).

Almost surely, 2^320990123 is an apocalyptic number.

320990123 is a deficient number, since it is larger than the sum of its proper divisors (16894237).

320990123 is a wasteful number, since it uses less digits than its factorization.

320990123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894236.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 320990123 is about 17916.1972248577. The cubic root of 320990123 is about 684.6951050446.

Subtracting 320990123 from its reverse (321099023), we obtain a square (108900 = 330²).

The spelling of 320990123 in words is "three hundred twenty million, nine hundred ninety thousand, one hundred twenty-three".