389666550 has 96 divisors (see below), whose sum is σ = 1189423872. Its totient is φ = 82212480.

The previous prime is 389666539. The next prime is 389666561. The reversal of 389666550 is 55666983.

It is an interprime number because it is at equal distance from previous prime (389666539) and next prime (389666561).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 389666550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 624 + ... + 27923.

It is an arithmetic number, because the mean of its divisors is an integer number (12389832).

Almost surely, 2^389666550 is an apocalyptic number.

389666550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 389666550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594711936).

389666550 is an abundant number, since it is smaller than the sum of its proper divisors (799757322).

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

389666550 is a wasteful number, since it uses less digits than its factorization.

389666550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28582 (or 28577 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The square root of 389666550 is about 19739.9734042374. The cubic root of 389666550 is about 730.4060729421.

The spelling of 389666550 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, five hundred fifty".