388816493 has 8 divisors (see below), whose sum is σ = 422640288. Its totient is φ = 355551984.

The previous prime is 388816487. The next prime is 388816507. The reversal of 388816493 is 394618883.

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

It is a cyclic number.

It is not a de Polignac number, because 388816493 - 2⁶ = 388816429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388816423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138371 + ... + 141152.

It is an arithmetic number, because the mean of its divisors is an integer number (52830036).

Almost surely, 2^388816493 is an apocalyptic number.

It is an amenable number.

388816493 is a deficient number, since it is larger than the sum of its proper divisors (33823795).

388816493 is a wasteful number, since it uses less digits than its factorization.

388816493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279643.

The product of its digits is 995328, while the sum is 50.

The square root of 388816493 is about 19718.4302874240. The cubic root of 388816493 is about 729.8745596683.

The spelling of 388816493 in words is "three hundred eighty-eight million, eight hundred sixteen thousand, four hundred ninety-three".