381503 has 4 divisors (see below), whose sum is σ = 383328. Its totient is φ = 379680.

The previous prime is 381487. The next prime is 381509. The reversal of 381503 is 305183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305183 = 61 ⋅5003.

It is a cyclic number.

It is not a de Polignac number, because 381503 - 2⁴ = 381487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381503.

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 3 ways as a sum of consecutive naturals, for example, 551 + ... + 1032.

It is an arithmetic number, because the mean of its divisors is an integer number (95832).

2³⁸¹⁵⁰³ is an apocalyptic number.

381503 is a deficient number, since it is larger than the sum of its proper divisors (1825).

381503 is a wasteful number, since it uses less digits than its factorization.

381503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

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

The square root of 381503 is about 617.6592911954. The cubic root of 381503 is about 72.5269341068.

Adding to 381503 its reverse (305183), we get a palindrome (686686).

The spelling of 381503 in words is "three hundred eighty-one thousand, five hundred three".