388020309 has 8 divisors (see below), whose sum is σ = 517565760. Its totient is φ = 258577536.

The previous prime is 388020301. The next prime is 388020313. The reversal of 388020309 is 903020883.

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

It is not a de Polignac number, because 388020309 - 2³ = 388020301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 388020309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388020301) by changing a digit.

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, 16369 + ... + 32310.

It is an arithmetic number, because the mean of its divisors is an integer number (64695720).

Almost surely, 2^388020309 is an apocalyptic number.

It is an amenable number.

388020309 is a deficient number, since it is larger than the sum of its proper divisors (129545451).

388020309 is a wasteful number, since it uses less digits than its factorization.

388020309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51339.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 388020309 is about 19698.2311134782. The cubic root of 388020309 is about 729.3760283900.

The spelling of 388020309 in words is "three hundred eighty-eight million, twenty thousand, three hundred nine".