389656509 has 16 divisors (see below), whose sum is σ = 582093120. Its totient is φ = 229772160.

The previous prime is 389656493. The next prime is 389656511. The reversal of 389656509 is 905656983.

It is not a de Polignac number, because 389656509 - 2⁴ = 389656493 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389656529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158344 + ... + 160785.

It is an arithmetic number, because the mean of its divisors is an integer number (36380820).

Almost surely, 2^389656509 is an apocalyptic number.

It is an amenable number.

389656509 is a deficient number, since it is larger than the sum of its proper divisors (192436611).

389656509 is a wasteful number, since it uses less digits than its factorization.

389656509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319180.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 389656509 is about 19739.7190709493. The cubic root of 389656509 is about 730.3997991417.

The spelling of 389656509 in words is "three hundred eighty-nine million, six hundred fifty-six thousand, five hundred nine".