321456789 has 8 divisors (see below), whose sum is σ = 476232320. Its totient is φ = 214304508.

The previous prime is 321456787. The next prime is 321456799. The reversal of 321456789 is 987654123.

321456789 is a `hidden beast` number, since 3 + 2 + 1 + 4 + 567 + 89 = 666.

It is not a de Polignac number, because 321456789 - 2¹ = 321456787 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321456781) 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, 5952877 + ... + 5952930.

It is an arithmetic number, because the mean of its divisors is an integer number (59529040).

Almost surely, 2^321456789 is an apocalyptic number.

It is an amenable number.

321456789 is a deficient number, since it is larger than the sum of its proper divisors (154775531).

321456789 is a wasteful number, since it uses less digits than its factorization.

321456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11905816 (or 11905810 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 321456789 is about 17929.2160732141. The cubic root of 321456789 is about 685.0267551309.

The spelling of 321456789 in words is "three hundred twenty-one million, four hundred fifty-six thousand, seven hundred eighty-nine".