389884409 has 12 divisors (see below), whose sum is σ = 415728348. Its totient is φ = 365568000.

The previous prime is 389884387. The next prime is 389884433. The reversal of 389884409 is 904488983.

It can be written as a sum of positive squares in 6 ways, for example, as 66064384 + 323820025 = 8128^2 + 17995^2 .

It is a de Polignac number, because none of the positive numbers 2^k-389884409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (389884499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78809 + ... + 83609.

It is an arithmetic number, because the mean of its divisors is an integer number (34644029).

Almost surely, 2^389884409 is an apocalyptic number.

It is an amenable number.

389884409 is a deficient number, since it is larger than the sum of its proper divisors (25843939).

389884409 is a wasteful number, since it uses less digits than its factorization.

389884409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 53.

The square root of 389884409 is about 19745.4908523440. The cubic root of 389884409 is about 730.5421686976.

The spelling of 389884409 in words is "three hundred eighty-nine million, eight hundred eighty-four thousand, four hundred nine".