423440434 has 4 divisors (see below), whose sum is σ = 635160654. Its totient is φ = 211720216.

The previous prime is 423440429. The next prime is 423440447. The reversal of 423440434 is 434044324.

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

It can be written as a sum of positive squares in only one way, i.e., 419225625 + 4214809 = 20475^2 + 2053^2 .

It is a super-2 number, since 2×423440434² = 358603602292216712, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 105860107 + ... + 105860110.

Almost surely, 2^423440434 is an apocalyptic number.

423440434 is a deficient number, since it is larger than the sum of its proper divisors (211720220).

423440434 is a wasteful number, since it uses less digits than its factorization.

423440434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211720219.

The product of its (nonzero) digits is 18432, while the sum is 28.

The square root of 423440434 is about 20577.6683324423. The cubic root of 423440434 is about 750.9265195367.

Adding to 423440434 its reverse (434044324), we get a palindrome (857484758).

The spelling of 423440434 in words is "four hundred twenty-three million, four hundred forty thousand, four hundred thirty-four".