381867981 has 8 divisors (see below), whose sum is σ = 555444384. Its totient is φ = 231435120.

The previous prime is 381867979. The next prime is 381867989. The reversal of 381867981 is 189768183.

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

It is not a de Polignac number, because 381867981 - 2¹ = 381867979 is a prime.

It is a super-2 number, since 2×381867981² = 291646309826032722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381867989) 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 7 ways as a sum of consecutive naturals, for example, 5785846 + ... + 5785911.

It is an arithmetic number, because the mean of its divisors is an integer number (69430548).

Almost surely, 2^381867981 is an apocalyptic number.

It is an amenable number.

381867981 is a deficient number, since it is larger than the sum of its proper divisors (173576403).

381867981 is a wasteful number, since it uses less digits than its factorization.

381867981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11571771.

The product of its digits is 580608, while the sum is 51.

The square root of 381867981 is about 19541.4426540110. The cubic root of 381867981 is about 725.5005538925.

The spelling of 381867981 in words is "three hundred eighty-one million, eight hundred sixty-seven thousand, nine hundred eighty-one".