493857421 has 2 divisors, whose sum is σ = 493857422. Its totient is φ = 493857420.

The previous prime is 493857401. The next prime is 493857433. The reversal of 493857421 is 124758394.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474760521 + 19096900 = 21789^2 + 4370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-493857421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (493857401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246928710 + 246928711.

It is an arithmetic number, because the mean of its divisors is an integer number (246928711).

Almost surely, 2^493857421 is an apocalyptic number.

It is an amenable number.

493857421 is a deficient number, since it is larger than the sum of its proper divisors (1).

493857421 is an equidigital number, since it uses as much as digits as its factorization.

493857421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 493857421 is about 22222.9030731811. The cubic root of 493857421 is about 790.4368790101.

The spelling of 493857421 in words is "four hundred ninety-three million, eight hundred fifty-seven thousand, four hundred twenty-one".