381705139 has 8 divisors (see below), whose sum is σ = 395158400. Its totient is φ = 368323200.

The previous prime is 381705133. The next prime is 381705143. The reversal of 381705139 is 931507183.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381705139 - 2⁹ = 381704627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381705098 and 381705107.

It is not an unprimeable number, because it can be changed into a prime (381705133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6822 + ... + 28459.

It is an arithmetic number, because the mean of its divisors is an integer number (49394800).

Almost surely, 2^381705139 is an apocalyptic number.

381705139 is a deficient number, since it is larger than the sum of its proper divisors (13453261).

381705139 is a wasteful number, since it uses less digits than its factorization.

381705139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35661.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 381705139 is about 19537.2756289100. The cubic root of 381705139 is about 725.3974128731.

The spelling of 381705139 in words is "three hundred eighty-one million, seven hundred five thousand, one hundred thirty-nine".