389778218 has 16 divisors (see below), whose sum is σ = 596409480. Its totient is φ = 190983936.

The previous prime is 389778211. The next prime is 389778229. The reversal of 389778218 is 812877983.

It can be written as a sum of positive squares in 4 ways, for example, as 350176369 + 39601849 = 18713^2 + 6293^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 389778218.

It is not an unprimeable number, because it can be changed into a prime (389778211) 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, 118046 + ... + 121302.

Almost surely, 2^389778218 is an apocalyptic number.

389778218 is a deficient number, since it is larger than the sum of its proper divisors (206631262).

389778218 is a wasteful number, since it uses less digits than its factorization.

389778218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441.

The product of its digits is 1354752, while the sum is 53.

The square root of 389778218 is about 19742.8016755475. The cubic root of 389778218 is about 730.4758378863.

The spelling of 389778218 in words is "three hundred eighty-nine million, seven hundred seventy-eight thousand, two hundred eighteen".