389921070 has 256 divisors, whose sum is σ = 1254113280. Its totient is φ = 75187200.

The previous prime is 389921057. The next prime is 389921101. The reversal of 389921070 is 70129983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2178241 + ... + 2178419.

It is an arithmetic number, because the mean of its divisors is an integer number (4898880).

Almost surely, 2^389921070 is an apocalyptic number.

389921070 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 389921070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627056640).

389921070 is an abundant number, since it is smaller than the sum of its proper divisors (864192210).

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

389921070 is a wasteful number, since it uses less digits than its factorization.

389921070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 389921070 is about 19746.4191690544. The cubic root of 389921070 is about 730.5650657123.

The spelling of 389921070 in words is "three hundred eighty-nine million, nine hundred twenty-one thousand, seventy".