400503 has 8 divisors (see below), whose sum is σ = 565488. Its totient is φ = 251264.

The previous prime is 400481. The next prime is 400523. The reversal of 400503 is 305004.

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

It is a cyclic number.

It is not a de Polignac number, because 400503 - 2⁵ = 400471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400523) 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 7 ways as a sum of consecutive naturals, for example, 3876 + ... + 3977.

It is an arithmetic number, because the mean of its divisors is an integer number (70686).

2⁴⁰⁰⁵⁰³ is an apocalyptic number.

400503 is a deficient number, since it is larger than the sum of its proper divisors (164985).

400503 is a wasteful number, since it uses less digits than its factorization.

400503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873.

The product of its (nonzero) digits is 60, while the sum is 12.

The square root of 400503 is about 632.8530635147. The cubic root of 400503 is about 73.7115015002.

Adding to 400503 its reverse (305004), we get a palindrome (705507).

It can be divided in two parts, 400 and 503, that added together give a triangular number (903 = T₄₂).

The spelling of 400503 in words is "four hundred thousand, five hundred three".