423857321 has 4 divisors (see below), whose sum is σ = 433714512. Its totient is φ = 414000132.

The previous prime is 423857267. The next prime is 423857333. The reversal of 423857321 is 123758324.

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 a de Polignac number, because none of the positive numbers 2^k-423857321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (423157321) 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, 4928531 + ... + 4928616.

It is an arithmetic number, because the mean of its divisors is an integer number (108428628).

Almost surely, 2^423857321 is an apocalyptic number.

It is an amenable number.

423857321 is a deficient number, since it is larger than the sum of its proper divisors (9857191).

423857321 is an equidigital number, since it uses as much as digits as its factorization.

423857321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9857190.

The product of its digits is 40320, while the sum is 35.

The square root of 423857321 is about 20587.7954380745. The cubic root of 423857321 is about 751.1728736080.

The spelling of 423857321 in words is "four hundred twenty-three million, eight hundred fifty-seven thousand, three hundred twenty-one".