388636840 has 32 divisors (see below), whose sum is σ = 882614880. Its totient is φ = 154000192.

The previous prime is 388636837. The next prime is 388636861. The reversal of 388636840 is 48636883.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 41122 + ... + 49681.

It is an arithmetic number, because the mean of its divisors is an integer number (27581715).

Almost surely, 2^388636840 is an apocalyptic number.

It is an amenable number.

388636840 is an abundant number, since it is smaller than the sum of its proper divisors (493978040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388636840 is a wasteful number, since it uses less digits than its factorization.

388636840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90921 (or 90917 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 388636840 is about 19713.8743021254. The cubic root of 388636840 is about 729.7621292912.

The spelling of 388636840 in words is "three hundred eighty-eight million, six hundred thirty-six thousand, eight hundred forty".