384638831 has 4 divisors (see below), whose sum is σ = 404883000. Its totient is φ = 364394664.

The previous prime is 384638819. The next prime is 384638851. The reversal of 384638831 is 138836483.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384638831 is a prime.

It is a super-2 number, since 2×384638831² = 295894060626093122, 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 (384638851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10122056 + ... + 10122093.

It is an arithmetic number, because the mean of its divisors is an integer number (101220750).

Almost surely, 2^384638831 is an apocalyptic number.

384638831 is a deficient number, since it is larger than the sum of its proper divisors (20244169).

384638831 is a wasteful number, since it uses less digits than its factorization.

384638831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20244168.

The product of its digits is 331776, while the sum is 44.

The square root of 384638831 is about 19612.2112725720. The cubic root of 384638831 is about 727.2510808240.

The spelling of 384638831 in words is "three hundred eighty-four million, six hundred thirty-eight thousand, eight hundred thirty-one".