389621878 has 16 divisors (see below), whose sum is σ = 627292080. Its totient is φ = 180838656.

The previous prime is 389621851. The next prime is 389621879. The reversal of 389621878 is 878126983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389621879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76008 + ... + 80971.

It is an arithmetic number, because the mean of its divisors is an integer number (39205755).

Almost surely, 2^389621878 is an apocalyptic number.

389621878 is a deficient number, since it is larger than the sum of its proper divisors (237670202).

389621878 is a wasteful number, since it uses less digits than its factorization.

389621878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157071.

The product of its digits is 1161216, while the sum is 52.

The square root of 389621878 is about 19738.8418606564. The cubic root of 389621878 is about 730.3781602331.

The spelling of 389621878 in words is "three hundred eighty-nine million, six hundred twenty-one thousand, eight hundred seventy-eight".