499993421 has 2 divisors, whose sum is σ = 499993422. Its totient is φ = 499993420.

The previous prime is 499993369. The next prime is 499993423. The reversal of 499993421 is 124399994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307616521 + 192376900 = 17539^2 + 13870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-499993421 is a prime.

Together with 499993423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 499993421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499993423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249996710 + 249996711.

It is an arithmetic number, because the mean of its divisors is an integer number (249996711).

Almost surely, 2^499993421 is an apocalyptic number.

It is an amenable number.

499993421 is a deficient number, since it is larger than the sum of its proper divisors (1).

499993421 is an equidigital number, since it uses as much as digits as its factorization.

499993421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 499993421 is about 22360.5326636017. The cubic root of 499993421 is about 793.6970447983.

The spelling of 499993421 in words is "four hundred ninety-nine million, nine hundred ninety-three thousand, four hundred twenty-one".