388428165 has 12 divisors (see below), whose sum is σ = 673275564. Its totient is φ = 207161664.

The previous prime is 388428151. The next prime is 388428167. The reversal of 388428165 is 561824883.

It can be written as a sum of positive squares in 2 ways, for example, as 162256644 + 226171521 = 12738^2 + 15039^2 .

It is not a de Polignac number, because 388428165 - 2⁷ = 388428037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 8631737 = 388428165 / (3 + 8 + 8 + 4 + 2 + 8 + 1 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 388428165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388428167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4315824 + ... + 4315913.

It is an arithmetic number, because the mean of its divisors is an integer number (56106297).

Almost surely, 2^388428165 is an apocalyptic number.

It is an amenable number.

388428165 is a deficient number, since it is larger than the sum of its proper divisors (284847399).

388428165 is a wasteful number, since it uses less digits than its factorization.

388428165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8631748 (or 8631745 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 388428165 is about 19708.5809991486. The cubic root of 388428165 is about 729.6314928714.

The spelling of 388428165 in words is "three hundred eighty-eight million, four hundred twenty-eight thousand, one hundred sixty-five".