381687907 has 4 divisors (see below), whose sum is σ = 381743280. Its totient is φ = 381632536.

The previous prime is 381687899. The next prime is 381687949. The reversal of 381687907 is 709786183.

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 381687907 - 2³ = 381687899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381607907) 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, 15583 + ... + 31720.

It is an arithmetic number, because the mean of its divisors is an integer number (95435820).

Almost surely, 2^381687907 is an apocalyptic number.

381687907 is a deficient number, since it is larger than the sum of its proper divisors (55373).

381687907 is an equidigital number, since it uses as much as digits as its factorization.

381687907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55372.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 381687907 is about 19536.8346207875. The cubic root of 381687907 is about 725.3864967365.

The spelling of 381687907 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, nine hundred seven".