389705 has 8 divisors (see below), whose sum is σ = 479304. Its totient is φ = 304000.

The previous prime is 389699. The next prime is 389713. The reversal of 389705 is 507983.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 373321 = 128^2 + 611^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-389705 is a prime.

It is a Duffinian number.

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 389705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (59913).

2³⁸⁹⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

389705 is a deficient number, since it is larger than the sum of its proper divisors (89599).

389705 is a wasteful number, since it uses less digits than its factorization.

389705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 389705 is about 624.2635661321. The cubic root of 389705 is about 73.0430096208.

The spelling of 389705 in words is "three hundred eighty-nine thousand, seven hundred five".