381530 has 8 divisors (see below), whose sum is σ = 686772. Its totient is φ = 152608.

The previous prime is 381529. The next prime is 381533. The reversal of 381530 is 35183.

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 841 = 617^2 + 29^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381530.

It is not an unprimeable number, because it can be changed into a prime (381533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19067 + ... + 19086.

2³⁸¹⁵³⁰ is an apocalyptic number.

381530 is a deficient number, since it is larger than the sum of its proper divisors (305242).

381530 is a wasteful number, since it uses less digits than its factorization.

381530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38160.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 381530 is about 617.6811475187. The cubic root of 381530 is about 72.5286450422.

It can be divided in two parts, 381 and 530, that multiplied together give a triangular number (201930 = T₆₃₅).

The spelling of 381530 in words is "three hundred eighty-one thousand, five hundred thirty".