503857381 has 4 divisors (see below), whose sum is σ = 505187200. Its totient is φ = 502527564.

The previous prime is 503857351. The next prime is 503857399. The reversal of 503857381 is 183758305.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183758305 = 5 ⋅36751661.

It is a cyclic number.

It is not a de Polignac number, because 503857381 - 2⁵ = 503857349 is a prime.

It is a super-2 number, since 2×503857381² = 507744520776358322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503857331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664341 + ... + 665098.

It is an arithmetic number, because the mean of its divisors is an integer number (126296800).

Almost surely, 2^503857381 is an apocalyptic number.

It is an amenable number.

503857381 is a deficient number, since it is larger than the sum of its proper divisors (1329819).

503857381 is a wasteful number, since it uses less digits than its factorization.

503857381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329818.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 503857381 is about 22446.7677183153. The cubic root of 503857381 is about 795.7363697940.

The spelling of 503857381 in words is "five hundred three million, eight hundred fifty-seven thousand, three hundred eighty-one".