381781673 has 16 divisors (see below), whose sum is σ = 470359680. Its totient is φ = 301764096.

The previous prime is 381781663. The next prime is 381781679. The reversal of 381781673 is 376187183.

It is a cyclic number.

It is not a de Polignac number, because 381781673 - 2¹² = 381777577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381781679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142361 + ... + 145017.

It is an arithmetic number, because the mean of its divisors is an integer number (29397480).

Almost surely, 2^381781673 is an apocalyptic number.

It is an amenable number.

381781673 is a deficient number, since it is larger than the sum of its proper divisors (88578007).

381781673 is a wasteful number, since it uses less digits than its factorization.

381781673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256.

The product of its digits is 169344, while the sum is 44.

The square root of 381781673 is about 19539.2341968666. The cubic root of 381781673 is about 725.4458917030.

The spelling of 381781673 in words is "three hundred eighty-one million, seven hundred eighty-one thousand, six hundred seventy-three".