321408889 has 4 divisors (see below), whose sum is σ = 328247424. Its totient is φ = 314570356.

The previous prime is 321408887. The next prime is 321408979. The reversal of 321408889 is 988804123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988804123 = 14387 ⋅68729.

It is a cyclic number.

It is not a de Polignac number, because 321408889 - 2¹ = 321408887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321408887) 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, 3419197 + ... + 3419290.

It is an arithmetic number, because the mean of its divisors is an integer number (82061856).

Almost surely, 2^321408889 is an apocalyptic number.

It is an amenable number.

321408889 is a deficient number, since it is larger than the sum of its proper divisors (6838535).

321408889 is an equidigital number, since it uses as much as digits as its factorization.

321408889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838534.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 321408889 is about 17927.8802149055. The cubic root of 321408889 is about 684.9927283580.

The spelling of 321408889 in words is "three hundred twenty-one million, four hundred eight thousand, eight hundred eighty-nine".