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328021 = 331991
BaseRepresentation
bin1010000000101010101
3121122221221
41100011111
540444041
611010341
72534221
oct1200525
9548857
10328021
112044a1
121399b1
13b63c5
1487781
15672d1
hex50155

328021 has 4 divisors (see below), whose sum is σ = 329344. Its totient is φ = 326700.

The previous prime is 328007. The next prime is 328037. The reversal of 328021 is 120823.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(328021) divides (328021-1)3.

It is a cyclic number.

It is not a de Polignac number, because 328021 - 213 = 319829 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 327986 and 328004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165 + ... + 826.

It is an arithmetic number, because the mean of its divisors is an integer number (82336).

2328021 is an apocalyptic number.

328021 is the 331-st octagonal number.

It is an amenable number.

328021 is a deficient number, since it is larger than the sum of its proper divisors (1323).

328021 is an equidigital number, since it uses as much as digits as its factorization.

328021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 328021 is about 572.7311760329. The cubic root of 328021 is about 68.9658165763.

Adding to 328021 its reverse (120823), we get a palindrome (448844).

The spelling of 328021 in words is "three hundred twenty-eight thousand, twenty-one".

Divisors: 1 331 991 328021