389435920 has 20 divisors (see below), whose sum is σ = 905438700. Its totient is φ = 155774336.

The previous prime is 389435909. The next prime is 389435927. The reversal of 389435920 is 29534983.

It can be written as a sum of positive squares in 2 ways, for example, as 192987664 + 196448256 = 13892^2 + 14016^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (389435927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2433895 + ... + 2434054.

It is an arithmetic number, because the mean of its divisors is an integer number (45271935).

Almost surely, 2^389435920 is an apocalyptic number.

It is an amenable number.

389435920 is an abundant number, since it is smaller than the sum of its proper divisors (516002780).

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

389435920 is a wasteful number, since it uses less digits than its factorization.

389435920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4867962 (or 4867956 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 389435920 is about 19734.1308397406. The cubic root of 389435920 is about 730.2619439019.

The spelling of 389435920 in words is "three hundred eighty-nine million, four hundred thirty-five thousand, nine hundred twenty".