388889444 has 6 divisors (see below), whose sum is σ = 680556534. Its totient is φ = 194444720.

The previous prime is 388889443. The next prime is 388889447. The reversal of 388889444 is 444988883.

It can be written as a sum of positive squares in only one way, i.e., 253446400 + 135443044 = 15920^2 + 11638^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 388889444.

It is not an unprimeable number, because it can be changed into a prime (388889443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48611177 + ... + 48611184.

It is an arithmetic number, because the mean of its divisors is an integer number (113426089).

Almost surely, 2^388889444 is an apocalyptic number.

It is an amenable number.

388889444 is a deficient number, since it is larger than the sum of its proper divisors (291667090).

388889444 is a wasteful number, since it uses less digits than its factorization.

388889444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97222365 (or 97222363 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 56.

The square root of 388889444 is about 19720.2800182959. The cubic root of 388889444 is about 729.9202039506.

The spelling of 388889444 in words is "three hundred eighty-eight million, eight hundred eighty-nine thousand, four hundred forty-four".