389990 has 16 divisors (see below), whose sum is σ = 714960. Its totient is φ = 153120.

The previous prime is 389989. The next prime is 389999. The reversal of 389990 is 99983.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 920.

It is an arithmetic number, because the mean of its divisors is an integer number (44685).

2³⁸⁹⁹⁹⁰ is an apocalyptic number.

389990 is a deficient number, since it is larger than the sum of its proper divisors (324970).

389990 is a wasteful number, since it uses less digits than its factorization.

389990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 389990 is about 624.4917933808. The cubic root of 389990 is about 73.0608112786.

The spelling of 389990 in words is "three hundred eighty-nine thousand, nine hundred ninety".