389812378 has 4 divisors (see below), whose sum is σ = 584718570. Its totient is φ = 194906188.

The previous prime is 389812361. The next prime is 389812433. The reversal of 389812378 is 873218983.

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

It can be written as a sum of positive squares in only one way, i.e., 359595369 + 30217009 = 18963^2 + 5497^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 97453093 + ... + 97453096.

Almost surely, 2^389812378 is an apocalyptic number.

389812378 is a deficient number, since it is larger than the sum of its proper divisors (194906192).

389812378 is a wasteful number, since it uses less digits than its factorization.

389812378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194906191.

The product of its digits is 580608, while the sum is 49.

The square root of 389812378 is about 19743.6667820342. Note that the first 3 decimals coincide. The cubic root of 389812378 is about 730.4971767952.

The spelling of 389812378 in words is "three hundred eighty-nine million, eight hundred twelve thousand, three hundred seventy-eight".