401403531 has 16 divisors (see below), whose sum is σ = 553103360. Its totient is φ = 258672960.

The previous prime is 401403511. The next prime is 401403539. The reversal of 401403531 is 135304104.

It is not a de Polignac number, because 401403531 - 2¹⁸ = 401141387 is a prime.

It is a super-2 number, since 2×401403531² = 322249589398535922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401403498 and 401403507.

It is not an unprimeable number, because it can be changed into a prime (401403539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103086 + ... + 106908.

It is an arithmetic number, because the mean of its divisors is an integer number (34568960).

Almost surely, 2^401403531 is an apocalyptic number.

401403531 is a deficient number, since it is larger than the sum of its proper divisors (151699829).

401403531 is a wasteful number, since it uses less digits than its factorization.

401403531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 401403531 is about 20035.0575492061. The cubic root of 401403531 is about 737.6670691501.

Adding to 401403531 its reverse (135304104), we get a palindrome (536707635).

The spelling of 401403531 in words is "four hundred one million, four hundred three thousand, five hundred thirty-one".