423320545 has 4 divisors (see below), whose sum is σ = 507984660. Its totient is φ = 338656432.

The previous prime is 423320537. The next prime is 423320549. The reversal of 423320545 is 545023324.

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

It can be written as a sum of positive squares in 2 ways, for example, as 302342544 + 120978001 = 17388^2 + 10999^2 .

It is a cyclic number.

It is not a de Polignac number, because 423320545 - 2³ = 423320537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423320549) 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, 42332050 + ... + 42332059.

It is an arithmetic number, because the mean of its divisors is an integer number (126996165).

Almost surely, 2^423320545 is an apocalyptic number.

It is an amenable number.

423320545 is a deficient number, since it is larger than the sum of its proper divisors (84664115).

423320545 is an equidigital number, since it uses as much as digits as its factorization.

423320545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84664114.

The product of its (nonzero) digits is 14400, while the sum is 28.

The square root of 423320545 is about 20574.7550410691. The cubic root of 423320545 is about 750.8556427221.

Adding to 423320545 its reverse (545023324), we get a palindrome (968343869).

The spelling of 423320545 in words is "four hundred twenty-three million, three hundred twenty thousand, five hundred forty-five".