389609640 has 192 divisors, whose sum is σ = 1454544000. Its totient is φ = 88598016.

The previous prime is 389609639. The next prime is 389609653. The reversal of 389609640 is 46906983.

389609640 is a `hidden beast` number, since 38 + 9 + 609 + 6 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 879259 + ... + 879701.

It is an arithmetic number, because the mean of its divisors is an integer number (7575750).

Almost surely, 2^389609640 is an apocalyptic number.

389609640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389609640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727272000).

389609640 is an abundant number, since it is smaller than the sum of its proper divisors (1064934360).

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

389609640 is a wasteful number, since it uses less digits than its factorization.

389609640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 389609640 is about 19738.5318602980. The cubic root of 389609640 is about 730.3705131082.

The spelling of 389609640 in words is "three hundred eighty-nine million, six hundred nine thousand, six hundred forty".