388389279 has 8 divisors (see below), whose sum is σ = 545107840. Its totient is φ = 245298456.

The previous prime is 388389277. The next prime is 388389283. The reversal of 388389279 is 972983883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 388389279 - 2¹ = 388389277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 6813847 = 388389279 / (3 + 8 + 8 + 3 + 8 + 9 + 2 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388389277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3406867 + ... + 3406980.

It is an arithmetic number, because the mean of its divisors is an integer number (68138480).

Almost surely, 2^388389279 is an apocalyptic number.

388389279 is a deficient number, since it is larger than the sum of its proper divisors (156718561).

388389279 is a wasteful number, since it uses less digits than its factorization.

388389279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6813869.

The product of its digits is 5225472, while the sum is 57.

The square root of 388389279 is about 19707.5944498561. The cubic root of 388389279 is about 729.6071439702.

The spelling of 388389279 in words is "three hundred eighty-eight million, three hundred eighty-nine thousand, two hundred seventy-nine".