389640 has 64 divisors (see below), whose sum is σ = 1244160. Its totient is φ = 97280.

The previous prime is 389629. The next prime is 389651. The reversal of 389640 is 46983.

It is an interprime number because it is at equal distance from previous prime (389629) and next prime (389651).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 389598 and 389607.

It is an unprimeable number.

389640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1945 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2³⁸⁹⁶⁴⁰ is an apocalyptic number.

389640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622080).

389640 is an abundant number, since it is smaller than the sum of its proper divisors (854520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389640 is a wasteful number, since it uses less digits than its factorization.

389640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 389640 is about 624.2115026175. The cubic root of 389640 is about 73.0389483783.

The spelling of 389640 in words is "three hundred eighty-nine thousand, six hundred forty".