423521408 has 72 divisors (see below), whose sum is σ = 904739745. Its totient is φ = 197441536.

The previous prime is 423521407. The next prime is 423521453. The reversal of 423521408 is 804125324.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 387617344 + 35904064 = 19688^2 + 5992^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14552.

It is not an unprimeable number, because it can be changed into a prime (423521407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3958091 + ... + 3958197.

Almost surely, 2^423521408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423521408

423521408 is an abundant number, since it is smaller than the sum of its proper divisors (481218337).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423521408 is an equidigital number, since it uses as much as digits as its factorization.

423521408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 423521408 is about 20579.6357596533. The cubic root of 423521408 is about 750.9743827413.

The spelling of 423521408 in words is "four hundred twenty-three million, five hundred twenty-one thousand, four hundred eight".