381863943 has 8 divisors (see below), whose sum is σ = 565724400. Its totient is φ = 254575944.

The previous prime is 381863927. The next prime is 381863947. The reversal of 381863943 is 349368183.

381863943 is a `hidden beast` number, since 3 + 8 + 1 + 8 + 639 + 4 + 3 = 666.

It is not a de Polignac number, because 381863943 - 2⁴ = 381863927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381863947) 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, 7071528 + ... + 7071581.

It is an arithmetic number, because the mean of its divisors is an integer number (70715550).

Almost surely, 2^381863943 is an apocalyptic number.

381863943 is a deficient number, since it is larger than the sum of its proper divisors (183860457).

381863943 is a wasteful number, since it uses less digits than its factorization.

381863943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14143118 (or 14143112 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 381863943 is about 19541.3393348562. The cubic root of 381863943 is about 725.4979966548.

The spelling of 381863943 in words is "three hundred eighty-one million, eight hundred sixty-three thousand, nine hundred forty-three".