381919861 has 8 divisors (see below), whose sum is σ = 385689600. Its totient is φ = 378162288.

The previous prime is 381919859. The next prime is 381919873. The reversal of 381919861 is 168919183.

It is a happy number.

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 381919861 - 2¹ = 381919859 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 (381919801) 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, 68040 + ... + 73438.

It is an arithmetic number, because the mean of its divisors is an integer number (48211200).

Almost surely, 2^381919861 is an apocalyptic number.

It is an amenable number.

381919861 is a deficient number, since it is larger than the sum of its proper divisors (3769739).

381919861 is a wasteful number, since it uses less digits than its factorization.

381919861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6083.

The product of its digits is 93312, while the sum is 46.

The square root of 381919861 is about 19542.7700441877. The cubic root of 381919861 is about 725.5334075367.

The spelling of 381919861 in words is "three hundred eighty-one million, nine hundred nineteen thousand, eight hundred sixty-one".