320739 has 16 divisors (see below), whose sum is σ = 478080. Its totient is φ = 190080.

The previous prime is 320713. The next prime is 320741. The reversal of 320739 is 937023.

It is not a de Polignac number, because 320739 - 2⁷ = 320611 is a prime.

It is a super-2 number, since 2×320739² = 205747012242, which contains 22 as substring.

320739 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320739.

It is not an unprimeable number, because it can be changed into a prime (320759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (29880).

2³²⁰⁷³⁹ is an apocalyptic number.

320739 is a deficient number, since it is larger than the sum of its proper divisors (157341).

320739 is a wasteful number, since it uses less digits than its factorization.

320739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 1134, while the sum is 24.

The square root of 320739 is about 566.3382381581. The cubic root of 320739 is about 68.4516503965.

The spelling of 320739 in words is "three hundred twenty thousand, seven hundred thirty-nine".