389857809 has 16 divisors (see below), whose sum is σ = 579133440. Its totient is φ = 231249360.

The previous prime is 389857799. The next prime is 389857837. The reversal of 389857809 is 908758983.

It is not a de Polignac number, because 389857809 - 2⁸ = 389857553 is a prime.

It is a super-2 number, since 2×389857809² = 303978222476560962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (389857859) 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, 124129 + ... + 127230.

It is an arithmetic number, because the mean of its divisors is an integer number (36195840).

Almost surely, 2^389857809 is an apocalyptic number.

It is an amenable number.

389857809 is a deficient number, since it is larger than the sum of its proper divisors (189275631).

389857809 is a wasteful number, since it uses less digits than its factorization.

389857809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251420.

The product of its (nonzero) digits is 4354560, while the sum is 57.

The square root of 389857809 is about 19744.8172693494. The cubic root of 389857809 is about 730.5255544883.

The spelling of 389857809 in words is "three hundred eighty-nine million, eight hundred fifty-seven thousand, eight hundred nine".