381667777 has 4 divisors (see below), whose sum is σ = 389788416. Its totient is φ = 373547140.

The previous prime is 381667771. The next prime is 381667807. The reversal of 381667777 is 777766183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381667777 - 2¹¹ = 381665729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381667771) 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, 4060249 + ... + 4060342.

It is an arithmetic number, because the mean of its divisors is an integer number (97447104).

Almost surely, 2^381667777 is an apocalyptic number.

It is an amenable number.

381667777 is a deficient number, since it is larger than the sum of its proper divisors (8120639).

381667777 is an equidigital number, since it uses as much as digits as its factorization.

381667777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8120638.

The product of its digits is 2074464, while the sum is 52.

The square root of 381667777 is about 19536.3194333017. The cubic root of 381667777 is about 725.3737443572.

The spelling of 381667777 in words is "three hundred eighty-one million, six hundred sixty-seven thousand, seven hundred seventy-seven".