420320123 has 4 divisors (see below), whose sum is σ = 420361128. Its totient is φ = 420279120.

The previous prime is 420320099. The next prime is 420320137. The reversal of 420320123 is 321023024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420320123 - 2²⁶ = 353211259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420320143) 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, 10088 + ... + 30698.

It is an arithmetic number, because the mean of its divisors is an integer number (105090282).

Almost surely, 2^420320123 is an apocalyptic number.

420320123 is a deficient number, since it is larger than the sum of its proper divisors (41005).

420320123 is a wasteful number, since it uses less digits than its factorization.

420320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41004.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 420320123 is about 20501.7102457332. The cubic root of 420320123 is about 749.0774570921.

Adding to 420320123 its reverse (321023024), we get a palindrome (741343147).

The spelling of 420320123 in words is "four hundred twenty million, three hundred twenty thousand, one hundred twenty-three".