401220503 has 4 divisors (see below), whose sum is σ = 406871568. Its totient is φ = 395569440.

The previous prime is 401220497. The next prime is 401220517. The reversal of 401220503 is 305022104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401220503 - 2¹⁰ = 401219479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401220583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825426 + ... + 2825567.

It is an arithmetic number, because the mean of its divisors is an integer number (101717892).

Almost surely, 2^401220503 is an apocalyptic number.

401220503 is a deficient number, since it is larger than the sum of its proper divisors (5651065).

401220503 is an equidigital number, since it uses as much as digits as its factorization.

401220503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5651064.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 401220503 is about 20030.4893350113. The cubic root of 401220503 is about 737.5549340676.

Adding to 401220503 its reverse (305022104), we get a palindrome (706242607).

The spelling of 401220503 in words is "four hundred one million, two hundred twenty thousand, five hundred three".