423767521 has 4 divisors (see below), whose sum is σ = 424332544. Its totient is φ = 423202500.

The previous prime is 423767503. The next prime is 423767527. The reversal of 423767521 is 125767324.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 423767521 - 2¹⁷ = 423636449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423767527) 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 3 ways as a sum of consecutive naturals, for example, 281385 + ... + 282886.

It is an arithmetic number, because the mean of its divisors is an integer number (106083136).

Almost surely, 2^423767521 is an apocalyptic number.

It is an amenable number.

423767521 is a deficient number, since it is larger than the sum of its proper divisors (565023).

423767521 is an equidigital number, since it uses as much as digits as its factorization.

423767521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565022.

The product of its digits is 70560, while the sum is 37.

The square root of 423767521 is about 20585.6144188120. The cubic root of 423767521 is about 751.1198210947.

The spelling of 423767521 in words is "four hundred twenty-three million, seven hundred sixty-seven thousand, five hundred twenty-one".