388215842 has 16 divisors (see below), whose sum is σ = 704661120. Its totient is φ = 156591168.

The previous prime is 388215829. The next prime is 388215853. The reversal of 388215842 is 248512883.

It is a self number, because there is not a number n which added to its sum of digits gives 388215842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815342 + ... + 815817.

It is an arithmetic number, because the mean of its divisors is an integer number (44041320).

Almost surely, 2^388215842 is an apocalyptic number.

388215842 is a deficient number, since it is larger than the sum of its proper divisors (316445278).

388215842 is a wasteful number, since it uses less digits than its factorization.

388215842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631185.

The product of its digits is 122880, while the sum is 41.

The square root of 388215842 is about 19703.1937005146. The cubic root of 388215842 is about 729.4985246703.

The spelling of 388215842 in words is "three hundred eighty-eight million, two hundred fifteen thousand, eight hundred forty-two".