388889278 has 8 divisors (see below), whose sum is σ = 583707168. Its totient is φ = 194320224.

The previous prime is 388889273. The next prime is 388889311. The reversal of 388889278 is 872988883.

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

It is a super-2 number, since 2×388889278² = 302469741086722568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388889273) 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, 58251 + ... + 64582.

It is an arithmetic number, because the mean of its divisors is an integer number (72963396).

Almost surely, 2^388889278 is an apocalyptic number.

388889278 is a deficient number, since it is larger than the sum of its proper divisors (194817890).

388889278 is a wasteful number, since it uses less digits than its factorization.

388889278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124418.

The product of its digits is 12386304, while the sum is 61.

The square root of 388889278 is about 19720.2758094303. The cubic root of 388889278 is about 729.9201000936.

The spelling of 388889278 in words is "three hundred eighty-eight million, eight hundred eighty-nine thousand, two hundred seventy-eight".