389138381 has 8 divisors (see below), whose sum is σ = 425320704. Its totient is φ = 354432960.

The previous prime is 389138377. The next prime is 389138389. The reversal of 389138381 is 183831983.

It is a happy number.

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 389138381 - 2² = 389138377 is a prime.

It is a super-2 number, since 2×389138381² = 302857359134602322, 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 (389138389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368675 + ... + 369728.

It is an arithmetic number, because the mean of its divisors is an integer number (53165088).

Almost surely, 2^389138381 is an apocalyptic number.

389138381 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

389138381 is a deficient number, since it is larger than the sum of its proper divisors (36182323).

389138381 is a wasteful number, since it uses less digits than its factorization.

389138381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738451.

The product of its digits is 124416, while the sum is 44.

The square root of 389138381 is about 19726.5907089897. The cubic root of 389138381 is about 730.0759169186.

The spelling of 389138381 in words is "three hundred eighty-nine million, one hundred thirty-eight thousand, three hundred eighty-one".