389921947 has 8 divisors (see below), whose sum is σ = 400764416. Its totient is φ = 379095552.

The previous prime is 389921929. The next prime is 389921951. The reversal of 389921947 is 749129983.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 389921947 - 2¹¹ = 389919899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389921894 and 389921903.

It is not an unprimeable number, because it can be changed into a prime (389921957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58363 + ... + 64699.

It is an arithmetic number, because the mean of its divisors is an integer number (50095552).

Almost surely, 2^389921947 is an apocalyptic number.

389921947 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

389921947 is a deficient number, since it is larger than the sum of its proper divisors (10842469).

389921947 is a wasteful number, since it uses less digits than its factorization.

389921947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037.

The product of its digits is 979776, while the sum is 52.

The square root of 389921947 is about 19746.4413755998. The cubic root of 389921947 is about 730.5656134343.

The spelling of 389921947 in words is "three hundred eighty-nine million, nine hundred twenty-one thousand, nine hundred forty-seven".