388665394 has 8 divisors (see below), whose sum is σ = 627844140. Its totient is φ = 179384016.

The previous prime is 388665313. The next prime is 388665397. The reversal of 388665394 is 493566883.

It can be written as a sum of positive squares in 2 ways, for example, as 299117025 + 89548369 = 17295^2 + 9463^2 .

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

It is not an unprimeable number, because it can be changed into a prime (388665397) 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, 7474309 + ... + 7474360.

Almost surely, 2^388665394 is an apocalyptic number.

388665394 is a deficient number, since it is larger than the sum of its proper divisors (239178746).

388665394 is a wasteful number, since it uses less digits than its factorization.

388665394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14948684.

The product of its digits is 3732480, while the sum is 52.

The square root of 388665394 is about 19714.5984995891. The cubic root of 388665394 is about 729.7800012609.

The spelling of 388665394 in words is "three hundred eighty-eight million, six hundred sixty-five thousand, three hundred ninety-four".