423502421 has 4 divisors (see below), whose sum is σ = 424236972. Its totient is φ = 422767872.

The previous prime is 423502411. The next prime is 423502451. The reversal of 423502421 is 124205324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 380796196 + 42706225 = 19514^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 423502421 - 2¹⁸ = 423240277 is a prime.

It is a super-2 number, since 2×423502421² = 358708601185722482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423502411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366410 + ... + 367563.

It is an arithmetic number, because the mean of its divisors is an integer number (106059243).

Almost surely, 2^423502421 is an apocalyptic number.

It is an amenable number.

423502421 is a deficient number, since it is larger than the sum of its proper divisors (734551).

423502421 is an equidigital number, since it uses as much as digits as its factorization.

423502421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734550.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 423502421 is about 20579.1744489423. The cubic root of 423502421 is about 750.9631601967.

Adding to 423502421 its reverse (124205324), we get a palindrome (547707745).

The spelling of 423502421 in words is "four hundred twenty-three million, five hundred two thousand, four hundred twenty-one".