388618 has 4 divisors (see below), whose sum is σ = 582930. Its totient is φ = 194308.

The previous prime is 388573. The next prime is 388621. The reversal of 388618 is 816883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 277729 + 110889 = 527^2 + 333^2 .

It is an unprimeable number.

388618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97153 + ... + 97156.

2³⁸⁸⁶¹⁸ is an apocalyptic number.

388618 is a deficient number, since it is larger than the sum of its proper divisors (194312).

388618 is a wasteful number, since it uses less digits than its factorization.

388618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194311.

The product of its digits is 9216, while the sum is 34.

The square root of 388618 is about 623.3923323237. The cubic root of 388618 is about 72.9750336842.

The spelling of 388618 in words is "three hundred eighty-eight thousand, six hundred eighteen".