389118640 has 80 divisors (see below), whose sum is σ = 949260672. Its totient is φ = 148165632.

The previous prime is 389118637. The next prime is 389118649. The reversal of 389118640 is 46811983.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 389118593 and 389118602.

It is not an unprimeable number, because it can be changed into a prime (389118649) 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, 137722 + ... + 140518.

Almost surely, 2^389118640 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 389118640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474630336).

389118640 is an abundant number, since it is smaller than the sum of its proper divisors (560142032).

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

389118640 is a wasteful number, since it uses less digits than its factorization.

389118640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894 (or 2888 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 389118640 is about 19726.0903374186. The cubic root of 389118640 is about 730.0635711199.

The spelling of 389118640 in words is "three hundred eighty-nine million, one hundred eighteen thousand, six hundred forty".