389405 has 8 divisors (see below), whose sum is σ = 492000. Its totient is φ = 295056.

The previous prime is 389401. The next prime is 389437. The reversal of 389405 is 504983.

389405 = 53² + 54² + ... + 109².

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 389405 - 2² = 389401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389401) 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, 1955 + ... + 2144.

It is an arithmetic number, because the mean of its divisors is an integer number (61500).

389405 is a Friedman number, since it can be written as 95*(8^4+3+0), using all its digits and the basic arithmetic operations.

2³⁸⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

389405 is a deficient number, since it is larger than the sum of its proper divisors (102595).

389405 is a wasteful number, since it uses less digits than its factorization.

389405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 389405 is about 624.0232367468. The cubic root of 389405 is about 73.0242616549.

Subtracting from 389405 its sum of digits (29), we obtain a square (389376 = 624²).

The spelling of 389405 in words is "three hundred eighty-nine thousand, four hundred five".