381871357 has 24 divisors (see below), whose sum is σ = 471857400. Its totient is φ = 307077120.

The previous prime is 381871351. The next prime is 381871379. The reversal of 381871357 is 753178183.

It can be written as a sum of positive squares in 4 ways, for example, as 135349956 + 246521401 = 11634^2 + 15701^2 .

It is not a de Polignac number, because 381871357 - 2³ = 381871349 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381871351) 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 23 ways as a sum of consecutive naturals, for example, 373507 + ... + 374527.

It is an arithmetic number, because the mean of its divisors is an integer number (19660725).

Almost surely, 2^381871357 is an apocalyptic number.

It is an amenable number.

381871357 is a deficient number, since it is larger than the sum of its proper divisors (89986043).

381871357 is a wasteful number, since it uses less digits than its factorization.

381871357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501 (or 1494 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 381871357 is about 19541.5290343412. The cubic root of 381871357 is about 725.5026918763.

The spelling of 381871357 in words is "three hundred eighty-one million, eight hundred seventy-one thousand, three hundred fifty-seven".