321428 has 12 divisors (see below), whose sum is σ = 568512. Its totient is φ = 159000.

The previous prime is 321427. The next prime is 321443. The reversal of 321428 is 824123.

321428 is nontrivially palindromic in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321428.

It is not an unprimeable number, because it can be changed into a prime (321427) 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, 53 + ... + 803.

It is an arithmetic number, because the mean of its divisors is an integer number (47376).

2³²¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

321428 is a deficient number, since it is larger than the sum of its proper divisors (247084).

321428 is a wasteful number, since it uses less digits than its factorization.

321428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 321428 is about 566.9462055610. The cubic root of 321428 is about 68.5006304664.

The spelling of 321428 in words is "three hundred twenty-one thousand, four hundred twenty-eight".