388646 has 4 divisors (see below), whose sum is σ = 582972. Its totient is φ = 194322.

The previous prime is 388621. The next prime is 388651. The reversal of 388646 is 646883.

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

It is a congruent number.

It is an unprimeable number.

388646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97160 + ... + 97163.

It is an arithmetic number, because the mean of its divisors is an integer number (145743).

2³⁸⁸⁶⁴⁶ is an apocalyptic number.

388646 is a deficient number, since it is larger than the sum of its proper divisors (194326).

388646 is a wasteful number, since it uses less digits than its factorization.

388646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194325.

The product of its digits is 27648, while the sum is 35.

The square root of 388646 is about 623.4147896866. The cubic root of 388646 is about 72.9767862637.

The spelling of 388646 in words is "three hundred eighty-eight thousand, six hundred forty-six".