403140321 has 10 divisors (see below), whose sum is σ = 602222082. Its totient is φ = 268760160.

The previous prime is 403140289. The next prime is 403140323. The reversal of 403140321 is 123041304.

It can be written as a sum of positive squares in only one way, i.e., 221861025 + 181279296 = 14895^2 + 13464^2 .

It is not a de Polignac number, because 403140321 - 2⁵ = 403140289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 403140294 and 403140303.

It is not an unprimeable number, because it can be changed into a prime (403140323) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2488440 + ... + 2488601.

Almost surely, 2^403140321 is an apocalyptic number.

It is an amenable number.

403140321 is a deficient number, since it is larger than the sum of its proper divisors (199081761).

403140321 is an equidigital number, since it uses as much as digits as its factorization.

403140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977053 (or 4977044 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 403140321 is about 20078.3545391548. The cubic root of 403140321 is about 738.7294492982.

Adding to 403140321 its reverse (123041304), we get a palindrome (526181625).

The spelling of 403140321 in words is "four hundred three million, one hundred forty thousand, three hundred twenty-one".