389780840 has 64 divisors (see below), whose sum is σ = 896313600. Its totient is φ = 152520192.

The previous prime is 389780837. The next prime is 389780843. The reversal of 389780840 is 48087983.

It is an interprime number because it is at equal distance from previous prime (389780837) and next prime (389780843).

It is a super-2 number, since 2×389780840² = 303858206462211200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (389780843) 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, 366149 + ... + 367211.

It is an arithmetic number, because the mean of its divisors is an integer number (14004900).

Almost surely, 2^389780840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389780840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (448156800).

389780840 is an abundant number, since it is smaller than the sum of its proper divisors (506532760).

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

389780840 is a wasteful number, since it uses less digits than its factorization.

389780840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 389780840 is about 19742.8680793850. The cubic root of 389780840 is about 730.4774758291.

The spelling of 389780840 in words is "three hundred eighty-nine million, seven hundred eighty thousand, eight hundred forty".