381716505 has 12 divisors (see below), whose sum is σ = 661642020. Its totient is φ = 203582112.

The previous prime is 381716483. The next prime is 381716507. The reversal of 381716505 is 505617183.

381716505 is a `hidden beast` number, since 3 + 81 + 71 + 6 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 170537481 + 211179024 = 13059^2 + 14532^2 .

It is not a de Polignac number, because 381716505 - 2¹⁵ = 381683737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381716505.

It is not an unprimeable number, because it can be changed into a prime (381716507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4241250 + ... + 4241339.

It is an arithmetic number, because the mean of its divisors is an integer number (55136835).

Almost surely, 2^381716505 is an apocalyptic number.

It is an amenable number.

381716505 is a deficient number, since it is larger than the sum of its proper divisors (279925515).

381716505 is a wasteful number, since it uses less digits than its factorization.

381716505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8482600 (or 8482597 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 381716505 is about 19537.5665066047. The cubic root of 381716505 is about 725.4046128331.

The spelling of 381716505 in words is "three hundred eighty-one million, seven hundred sixteen thousand, five hundred five".