381033647 has 4 divisors (see below), whose sum is σ = 386253360. Its totient is φ = 375813936.

The previous prime is 381033643. The next prime is 381033673. The reversal of 381033647 is 746330183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381033647 - 2² = 381033643 is a prime.

It is a super-2 number, since 2×381033647² = 290373280292241218, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381033643) 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 3 ways as a sum of consecutive naturals, for example, 2609747 + ... + 2609892.

It is an arithmetic number, because the mean of its divisors is an integer number (96563340).

Almost surely, 2^381033647 is an apocalyptic number.

381033647 is a deficient number, since it is larger than the sum of its proper divisors (5219713).

381033647 is an equidigital number, since it uses as much as digits as its factorization.

381033647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5219712.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 381033647 is about 19520.0831709294. The cubic root of 381033647 is about 724.9717924816.

The spelling of 381033647 in words is "three hundred eighty-one million, thirty-three thousand, six hundred forty-seven".