388955381 has 8 divisors (see below), whose sum is σ = 392132664. Its totient is φ = 385789120.

The previous prime is 388955321. The next prime is 388955383. The reversal of 388955381 is 183559883.

It can be written as a sum of positive squares in 4 ways, for example, as 66178225 + 322777156 = 8135^2 + 17966^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388955381 is a prime.

It is a super-2 number, since 2×388955381² = 302572576817710322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388955383) 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, 77315 + ... + 82191.

It is an arithmetic number, because the mean of its divisors is an integer number (49016583).

Almost surely, 2^388955381 is an apocalyptic number.

It is an amenable number.

388955381 is a deficient number, since it is larger than the sum of its proper divisors (3177283).

388955381 is a wasteful number, since it uses less digits than its factorization.

388955381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511.

The product of its digits is 1036800, while the sum is 50.

The square root of 388955381 is about 19721.9517543270. The cubic root of 388955381 is about 729.9614547734.

The spelling of 388955381 in words is "three hundred eighty-eight million, nine hundred fifty-five thousand, three hundred eighty-one".