389661807 has 4 divisors (see below), whose sum is σ = 519549080. Its totient is φ = 259774536.

The previous prime is 389661803. The next prime is 389661821. The reversal of 389661807 is 708166983.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 389661807 - 2² = 389661803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389661803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64943632 + ... + 64943637.

It is an arithmetic number, because the mean of its divisors is an integer number (129887270).

Almost surely, 2^389661807 is an apocalyptic number.

389661807 is a deficient number, since it is larger than the sum of its proper divisors (129887273).

389661807 is a wasteful number, since it uses less digits than its factorization.

389661807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129887272.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 389661807 is about 19739.8532669318. The cubic root of 389661807 is about 730.4031094424.

It can be divided in two parts, 3896 and 61807, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 389661807 in words is "three hundred eighty-nine million, six hundred sixty-one thousand, eight hundred seven".