320749 has 8 divisors (see below), whose sum is σ = 376992. Its totient is φ = 269040.

The previous prime is 320741. The next prime is 320759. The reversal of 320749 is 947023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320749 - 2³ = 320741 is a prime.

320749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320741) 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 7 ways as a sum of consecutive naturals, for example, 979 + ... + 1264.

It is an arithmetic number, because the mean of its divisors is an integer number (47124).

2³²⁰⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

320749 is a deficient number, since it is larger than the sum of its proper divisors (56243).

320749 is a wasteful number, since it uses less digits than its factorization.

320749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 320749 is about 566.3470667356. The cubic root of 320749 is about 68.4523617843.

The spelling of 320749 in words is "three hundred twenty thousand, seven hundred forty-nine".