381505 has 8 divisors (see below), whose sum is σ = 469224. Its totient is φ = 297600.

The previous prime is 381487. The next prime is 381509. The reversal of 381505 is 505183.

It can be written as a sum of positive squares in 4 ways, for example, as 41616 + 339889 = 204^2 + 583^2 .

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

It is not a de Polignac number, because 381505 - 2⁷ = 381377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381509) 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, 726 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (58653).

2³⁸¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

381505 is a deficient number, since it is larger than the sum of its proper divisors (87719).

381505 is a wasteful number, since it uses less digits than its factorization.

381505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 381505 is about 617.6609102088. The cubic root of 381505 is about 72.5270608455.

Adding to 381505 its reverse (505183), we get a palindrome (886688).

The spelling of 381505 in words is "three hundred eighty-one thousand, five hundred five".