6389820 has 48 divisors (see below), whose sum is σ = 19881120. Its totient is φ = 1703808.

The previous prime is 6389819. The next prime is 6389821. The reversal of 6389820 is 289836.

It is an interprime number because it is at equal distance from previous prime (6389819) and next prime (6389821).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 6⁷ + 3¹³ + 8² + 9⁵ + 8⁶ + 2²² + 0 .

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6389821) 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, 5377 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (414190).

Almost surely, 2^6389820 is an apocalyptic number.

6389820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6389820 is an abundant number, since it is smaller than the sum of its proper divisors (13491300).

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

6389820 is a wasteful number, since it uses less digits than its factorization.

6389820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851 (or 11843 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 6389820 is about 2527.8093282524. The cubic root of 6389820 is about 185.5650607413.

The spelling of 6389820 in words is "six million, three hundred eighty-nine thousand, eight hundred twenty".