388242161 has 4 divisors (see below), whose sum is σ = 397711524. Its totient is φ = 378772800.

The previous prime is 388242131. The next prime is 388242163. The reversal of 388242161 is 161242883.

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

It can be written as a sum of positive squares in 2 ways, for example, as 201072400 + 187169761 = 14180^2 + 13681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388242161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388242163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4734620 + ... + 4734701.

It is an arithmetic number, because the mean of its divisors is an integer number (99427881).

Almost surely, 2^388242161 is an apocalyptic number.

It is an amenable number.

388242161 is a deficient number, since it is larger than the sum of its proper divisors (9469363).

388242161 is an equidigital number, since it uses as much as digits as its factorization.

388242161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469362.

The product of its digits is 18432, while the sum is 35.

The square root of 388242161 is about 19703.8615758435. The cubic root of 388242161 is about 729.5150096903.

The spelling of 388242161 in words is "three hundred eighty-eight million, two hundred forty-two thousand, one hundred sixty-one".