328749 has 4 divisors (see below), whose sum is σ = 438336. Its totient is φ = 219164.

The previous prime is 328721. The next prime is 328753. The reversal of 328749 is 947823.

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.

It is a cyclic number.

It is not a de Polignac number, because 328749 - 2⁷ = 328621 is a prime.

It is a super-5 number, since 5×328749⁵ (a number of 29 digits) contains 55555 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328709) 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, 54789 + ... + 54794.

It is an arithmetic number, because the mean of its divisors is an integer number (109584).

2³²⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

328749 is a deficient number, since it is larger than the sum of its proper divisors (109587).

328749 is a wasteful number, since it uses less digits than its factorization.

328749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109586.

The product of its digits is 12096, while the sum is 33.

The square root of 328749 is about 573.3663750169. The cubic root of 328749 is about 69.0167991023.

The spelling of 328749 in words is "three hundred twenty-eight thousand, seven hundred forty-nine".