381687239 has 4 divisors (see below), whose sum is σ = 382255056. Its totient is φ = 381119424.

The previous prime is 381687209. The next prime is 381687259. The reversal of 381687239 is 932786183.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381687239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381687193 and 381687202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381687209) 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, 282899 + ... + 284244.

It is an arithmetic number, because the mean of its divisors is an integer number (95563764).

Almost surely, 2^381687239 is an apocalyptic number.

381687239 is a deficient number, since it is larger than the sum of its proper divisors (567817).

381687239 is an equidigital number, since it uses as much as digits as its factorization.

381687239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567816.

The product of its digits is 435456, while the sum is 47.

The square root of 381687239 is about 19536.8175248683. The cubic root of 381687239 is about 725.3860735649.

The spelling of 381687239 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, two hundred thirty-nine".