381688267 has 4 divisors (see below), whose sum is σ = 404140536. Its totient is φ = 359236000.

The previous prime is 381688259. The next prime is 381688291. The reversal of 381688267 is 762886183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 762886183 = 389 ⋅1961147.

It is a cyclic number.

It is not a de Polignac number, because 381688267 - 2³ = 381688259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381688267.

It is not an unprimeable number, because it can be changed into a prime (381688067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11226109 + ... + 11226142.

It is an arithmetic number, because the mean of its divisors is an integer number (101035134).

Almost surely, 2^381688267 is an apocalyptic number.

381688267 is a deficient number, since it is larger than the sum of its proper divisors (22452269).

381688267 is a wasteful number, since it uses less digits than its factorization.

381688267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22452268.

The product of its digits is 774144, while the sum is 49.

The square root of 381688267 is about 19536.8438341509. The cubic root of 381688267 is about 725.3867247928.

The spelling of 381688267 in words is "three hundred eighty-one million, six hundred eighty-eight thousand, two hundred sixty-seven".