381721867 has 8 divisors (see below), whose sum is σ = 397771200. Its totient is φ = 365865024.

The previous prime is 381721841. The next prime is 381721871. The reversal of 381721867 is 768127183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381721867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381721807) 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 7 ways as a sum of consecutive naturals, for example, 44067 + ... + 52012.

It is an arithmetic number, because the mean of its divisors is an integer number (49721400).

Almost surely, 2^381721867 is an apocalyptic number.

381721867 is a deficient number, since it is larger than the sum of its proper divisors (16049333).

381721867 is a wasteful number, since it uses less digits than its factorization.

381721867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96245.

The product of its digits is 112896, while the sum is 43.

The square root of 381721867 is about 19537.7037289442. The cubic root of 381721867 is about 725.4080094213.

The spelling of 381721867 in words is "three hundred eighty-one million, seven hundred twenty-one thousand, eight hundred sixty-seven".