388890289 has 4 divisors (see below), whose sum is σ = 398375460. Its totient is φ = 379405120.

The previous prime is 388890287. The next prime is 388890301. The reversal of 388890289 is 982098883.

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 72335025 + 316555264 = 8505^2 + 17792^2 .

It is a cyclic number.

It is not a de Polignac number, because 388890289 - 2¹ = 388890287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388890287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4742524 + ... + 4742605.

It is an arithmetic number, because the mean of its divisors is an integer number (99593865).

Almost surely, 2^388890289 is an apocalyptic number.

It is an amenable number.

388890289 is a deficient number, since it is larger than the sum of its proper divisors (9485171).

388890289 is an equidigital number, since it uses as much as digits as its factorization.

388890289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9485170.

The product of its (nonzero) digits is 1990656, while the sum is 55.

The square root of 388890289 is about 19720.3014429293. The cubic root of 388890289 is about 729.9207326203.

The spelling of 388890289 in words is "three hundred eighty-eight million, eight hundred ninety thousand, two hundred eighty-nine".