388165881 has 8 divisors (see below), whose sum is σ = 518751520. Its totient is φ = 258178752.

The previous prime is 388165873. The next prime is 388165889. The reversal of 388165881 is 188561883.

It is an interprime number because it is at equal distance from previous prime (388165873) and next prime (388165889).

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

It is not a de Polignac number, because 388165881 - 2³ = 388165873 is a prime.

It is a super-2 number, since 2×388165881² = 301345502345012322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 388165881.

It is not an unprimeable number, because it can be changed into a prime (388165889) 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, 148111 + ... + 150708.

It is an arithmetic number, because the mean of its divisors is an integer number (64843940).

Almost surely, 2^388165881 is an apocalyptic number.

It is an amenable number.

388165881 is a deficient number, since it is larger than the sum of its proper divisors (130585639).

388165881 is a wasteful number, since it uses less digits than its factorization.

388165881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299255.

The product of its digits is 368640, while the sum is 48.

The square root of 388165881 is about 19701.9258195741. The cubic root of 388165881 is about 729.4672293311.

The spelling of 388165881 in words is "three hundred eighty-eight million, one hundred sixty-five thousand, eight hundred eighty-one".