381446387 has 8 divisors (see below), whose sum is σ = 443328000. Its totient is φ = 321412104.

The previous prime is 381446369. The next prime is 381446393. The reversal of 381446387 is 783644183.

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 381446387 - 2¹² = 381442291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381446327) 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, 461387 + ... + 462212.

It is an arithmetic number, because the mean of its divisors is an integer number (55416000).

Almost surely, 2^381446387 is an apocalyptic number.

381446387 is a deficient number, since it is larger than the sum of its proper divisors (61881613).

381446387 is an equidigital number, since it uses as much as digits as its factorization.

381446387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923665.

The product of its digits is 387072, while the sum is 44.

The square root of 381446387 is about 19530.6524980606. The cubic root of 381446387 is about 725.2334639322.

The spelling of 381446387 in words is "three hundred eighty-one million, four hundred forty-six thousand, three hundred eighty-seven".