423021545 has 4 divisors (see below), whose sum is σ = 507625860. Its totient is φ = 338417232.

The previous prime is 423021509. The next prime is 423021569. The reversal of 423021545 is 545120324.

It is a happy number.

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 45535504 + 377486041 = 6748^2 + 19429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423021545 is a prime.

It is an unprimeable number.

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, 42302150 + ... + 42302159.

It is an arithmetic number, because the mean of its divisors is an integer number (126906465).

Almost surely, 2^423021545 is an apocalyptic number.

It is an amenable number.

423021545 is a deficient number, since it is larger than the sum of its proper divisors (84604315).

423021545 is an equidigital number, since it uses as much as digits as its factorization.

423021545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84604314.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 423021545 is about 20567.4875714075. The cubic root of 423021545 is about 750.6788194942.

Adding to 423021545 its reverse (545120324), we get a palindrome (968141869).

The spelling of 423021545 in words is "four hundred twenty-three million, twenty-one thousand, five hundred forty-five".