423456789 has 16 divisors (see below), whose sum is σ = 649382528. Its totient is φ = 240432192.

The previous prime is 423456773. The next prime is 423456799. The reversal of 423456789 is 987654324.

It is not a de Polignac number, because 423456789 - 2⁴ = 423456773 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423456739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60922 + ... + 67515.

It is an arithmetic number, because the mean of its divisors is an integer number (40586408).

Almost surely, 2^423456789 is an apocalyptic number.

It is an amenable number.

423456789 is a deficient number, since it is larger than the sum of its proper divisors (225925739).

423456789 is a wasteful number, since it uses less digits than its factorization.

423456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128604.

The product of its digits is 1451520, while the sum is 48.

The square root of 423456789 is about 20578.0657254272. The cubic root of 423456789 is about 750.9361873625.

The spelling of 423456789 in words is "four hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine".