403042421 has 6 divisors (see below), whose sum is σ = 425372022. Its totient is φ = 381829320.

The previous prime is 403042351. The next prime is 403042429. The reversal of 403042421 is 124240304.

It can be written as a sum of positive squares in only one way, i.e., 339664900 + 63377521 = 18430^2 + 7961^2 .

It is not a de Polignac number, because 403042421 - 2¹⁴ = 403026037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 403042393 and 403042402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403042429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 557870 + ... + 558591.

It is an arithmetic number, because the mean of its divisors is an integer number (70895337).

Almost surely, 2^403042421 is an apocalyptic number.

It is an amenable number.

403042421 is a deficient number, since it is larger than the sum of its proper divisors (22329601).

403042421 is a wasteful number, since it uses less digits than its factorization.

403042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116499 (or 1116480 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 403042421 is about 20075.9164423445. The cubic root of 403042421 is about 738.6696459126.

Adding to 403042421 its reverse (124240304), we get a palindrome (527282725).

The spelling of 403042421 in words is "four hundred three million, forty-two thousand, four hundred twenty-one".