389665040 has 80 divisors (see below), whose sum is σ = 948796416. Its totient is φ = 148646400.

The previous prime is 389664991. The next prime is 389665043. The reversal of 389665040 is 40566983.

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

It is not an unprimeable number, because it can be changed into a prime (389665043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174974 + ... + 177186.

Almost surely, 2^389665040 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 389665040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474398208).

389665040 is an abundant number, since it is smaller than the sum of its proper divisors (559131376).

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

389665040 is a wasteful number, since it uses less digits than its factorization.

389665040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328 (or 2322 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 389665040 is about 19739.9351569350. The cubic root of 389665040 is about 730.4051294734.

The spelling of 389665040 in words is "three hundred eighty-nine million, six hundred sixty-five thousand, forty".