389643450 has 96 divisors (see below), whose sum is σ = 1162544640. Its totient is φ = 84369600.

The previous prime is 389643421. The next prime is 389643461. The reversal of 389643450 is 54346983.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

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, 10185 + ... + 29715.

It is an arithmetic number, because the mean of its divisors is an integer number (12109840).

Almost surely, 2^389643450 is an apocalyptic number.

389643450 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 389643450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (581272320).

389643450 is an abundant number, since it is smaller than the sum of its proper divisors (772901190).

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

389643450 is a wasteful number, since it uses less digits than its factorization.

389643450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19572 (or 19567 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 389643450 is about 19739.3882883943. The cubic root of 389643450 is about 730.3916394786.

It can be divided in two parts, 389643 and 450, that added together give a palindrome (390093).

The spelling of 389643450 in words is "three hundred eighty-nine million, six hundred forty-three thousand, four hundred fifty".