423907321 has 2 divisors, whose sum is σ = 423907322. Its totient is φ = 423907320.

The previous prime is 423907313. The next prime is 423907339. The reversal of 423907321 is 123709324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423906921 + 400 = 20589^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 423907321 - 2³ = 423907313 is a prime.

It is not a weakly prime, because it can be changed into another prime (423907391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211953660 + 211953661.

It is an arithmetic number, because the mean of its divisors is an integer number (211953661).

Almost surely, 2^423907321 is an apocalyptic number.

It is an amenable number.

423907321 is a deficient number, since it is larger than the sum of its proper divisors (1).

423907321 is an equidigital number, since it uses as much as digits as its factorization.

423907321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 423907321 is about 20589.0097139226. The cubic root of 423907321 is about 751.2024096217.

The spelling of 423907321 in words is "four hundred twenty-three million, nine hundred seven thousand, three hundred twenty-one".