381856613 has 8 divisors (see below), whose sum is σ = 392424480. Its totient is φ = 371301840.

The previous prime is 381856609. The next prime is 381856619. The reversal of 381856613 is 316658183.

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 381856613 - 2² = 381856609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381856619) 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, 99158 + ... + 102936.

It is an arithmetic number, because the mean of its divisors is an integer number (49053060).

Almost surely, 2^381856613 is an apocalyptic number.

It is an amenable number.

381856613 is a deficient number, since it is larger than the sum of its proper divisors (10567867).

381856613 is a wasteful number, since it uses less digits than its factorization.

381856613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547.

The product of its digits is 103680, while the sum is 41.

The square root of 381856613 is about 19541.1517828402. The cubic root of 381856613 is about 725.4933545701.

The spelling of 381856613 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, six hundred thirteen".