403144421 has 2 divisors, whose sum is σ = 403144422. Its totient is φ = 403144420.

The previous prime is 403144397. The next prime is 403144439. The reversal of 403144421 is 124441304.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320589025 + 82555396 = 17905^2 + 9086^2 .

It is a cyclic number.

It is not a de Polignac number, because 403144421 - 2¹⁰ = 403143397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403144121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201572210 + 201572211.

It is an arithmetic number, because the mean of its divisors is an integer number (201572211).

Almost surely, 2^403144421 is an apocalyptic number.

It is an amenable number.

403144421 is a deficient number, since it is larger than the sum of its proper divisors (1).

403144421 is an equidigital number, since it uses as much as digits as its factorization.

403144421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 403144421 is about 20078.4566388953. The cubic root of 403144421 is about 738.7319536210.

Adding to 403144421 its reverse (124441304), we get a palindrome (527585725).

The spelling of 403144421 in words is "four hundred three million, one hundred forty-four thousand, four hundred twenty-one".