321489 has 27 divisors (see below), whose sum is σ = 560937.
Its totient is φ = 183708.
The previous prime is 321469. The next prime is 321509. The reversal of 321489 is 984123.
The square root of 321489 is 567.
It is a perfect power (a square), and thus also a powerful number.
It is an interprime number because it is at equal distance from previous prime (321469) and next prime (321509).
It is a tau number, because it is divible by the number of its divisors (27).
It is not a de Polignac number, because 321489 - 211 = 319441 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a nialpdrome in base 9.
It is not an unprimeable number, because it can be changed into a prime (321449) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 45924 + ... + 45930.
321489 is a Friedman number, since it can be written as 49/(3^(1-2))^8, using all its digits and the basic arithmetic operations.
2321489 is an apocalyptic number.
321489 is the 567-th square number.
321489 is the 284-th centered octagonal number.
It is an amenable number.
321489 is a deficient number, since it is larger than the sum of its proper divisors (239448).
321489 is an frugal number, since it uses more digits than its factorization.
321489 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 38 (or 10 counting only the distinct ones).
The product of its digits is 1728, while the sum is 27.
The cubic root of 321489 is about 68.5049634992.
It can be divided in two parts, 32 and 1489, that added together give a square (1521 = 392).
The spelling of 321489 in words is "three hundred twenty-one thousand, four hundred eighty-nine".