403344421 has 2 divisors, whose sum is σ = 403344422. Its totient is φ = 403344420.

The previous prime is 403344419. The next prime is 403344433. The reversal of 403344421 is 124443304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399400225 + 3944196 = 19985^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 403344421 - 2¹ = 403344419 is a prime.

Together with 403344419, it forms a pair of twin primes.

It is equal to p_21505039 and since 403344421 and 21505039 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403314421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201672210 + 201672211.

It is an arithmetic number, because the mean of its divisors is an integer number (201672211).

Almost surely, 2^403344421 is an apocalyptic number.

It is an amenable number.

403344421 is a deficient number, since it is larger than the sum of its proper divisors (1).

403344421 is an equidigital number, since it uses as much as digits as its factorization.

403344421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 403344421 is about 20083.4364838292. The cubic root of 403344421 is about 738.8540950980.

Adding to 403344421 its reverse (124443304), we get a palindrome (527787725).

The spelling of 403344421 in words is "four hundred three million, three hundred forty-four thousand, four hundred twenty-one".