423432421 has 8 divisors (see below), whose sum is σ = 426008088. Its totient is φ = 420864000.

The previous prime is 423432397. The next prime is 423432431. The reversal of 423432421 is 124234324.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 156600196 + 266832225 = 12514^2 + 16335^2 .

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 423432421 - 2⁵ = 423432389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423432431) 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, 153111 + ... + 155851.

It is an arithmetic number, because the mean of its divisors is an integer number (53251011).

Almost surely, 2^423432421 is an apocalyptic number.

It is an amenable number.

423432421 is a deficient number, since it is larger than the sum of its proper divisors (2575667).

423432421 is a wasteful number, since it uses less digits than its factorization.

423432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623.

The product of its digits is 4608, while the sum is 25.

The square root of 423432421 is about 20577.4736301617. The cubic root of 423432421 is about 750.9217827727.

Adding to 423432421 its reverse (124234324), we get a palindrome (547666745).

The spelling of 423432421 in words is "four hundred twenty-three million, four hundred thirty-two thousand, four hundred twenty-one".