381554816 has 32 divisors (see below), whose sum is σ = 771491280. Its totient is φ = 187925760.

The previous prime is 381554813. The next prime is 381554821. The reversal of 381554816 is 618455183.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×381554816² = 291168155225587712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381554813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13670 + ... + 30821.

Almost surely, 2^381554816 is an apocalyptic number.

It is an amenable number.

381554816 is an abundant number, since it is smaller than the sum of its proper divisors (389936464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381554816 is an equidigital number, since it uses as much as digits as its factorization.

381554816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44572 (or 44560 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 381554816 is about 19533.4281681429. The cubic root of 381554816 is about 725.3021751081.

The spelling of 381554816 in words is "three hundred eighty-one million, five hundred fifty-four thousand, eight hundred sixteen".