423040521 has 4 divisors (see below), whose sum is σ = 564054032. Its totient is φ = 282027012.

The previous prime is 423040517. The next prime is 423040531. The reversal of 423040521 is 125040324.

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 not a de Polignac number, because 423040521 - 2² = 423040517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423040531) 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, 70506751 + ... + 70506756.

It is an arithmetic number, because the mean of its divisors is an integer number (141013508).

Almost surely, 2^423040521 is an apocalyptic number.

It is an amenable number.

423040521 is a deficient number, since it is larger than the sum of its proper divisors (141013511).

423040521 is a wasteful number, since it uses less digits than its factorization.

423040521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141013510.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 423040521 is about 20567.9488768326. The cubic root of 423040521 is about 750.6900440354.

Adding to 423040521 its reverse (125040324), we get a palindrome (548080845).

The spelling of 423040521 in words is "four hundred twenty-three million, forty thousand, five hundred twenty-one".