423731521 has 8 divisors (see below), whose sum is σ = 446266080. Its totient is φ = 401220288.

The previous prime is 423731513. The next prime is 423731533. The reversal of 423731521 is 125137324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 423731521 - 2³ = 423731513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 423731521.

It is not an unprimeable number, because it can be changed into a prime (423761521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41310 + ... + 50536.

It is an arithmetic number, because the mean of its divisors is an integer number (55783260).

Almost surely, 2^423731521 is an apocalyptic number.

It is an amenable number.

423731521 is a deficient number, since it is larger than the sum of its proper divisors (22534559).

423731521 is a wasteful number, since it uses less digits than its factorization.

423731521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11663.

The product of its digits is 5040, while the sum is 28.

The square root of 423731521 is about 20584.7400032160. The cubic root of 423731521 is about 751.0985507220.

Adding to 423731521 its reverse (125137324), we get a palindrome (548868845).

The spelling of 423731521 in words is "four hundred twenty-three million, seven hundred thirty-one thousand, five hundred twenty-one".