418243421 has 2 divisors, whose sum is σ = 418243422. Its totient is φ = 418243420.

The previous prime is 418243417. The next prime is 418243429. The reversal of 418243421 is 124342814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231374521 + 186868900 = 15211^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 418243421 - 2² = 418243417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418243429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209121710 + 209121711.

It is an arithmetic number, because the mean of its divisors is an integer number (209121711).

Almost surely, 2^418243421 is an apocalyptic number.

It is an amenable number.

418243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

418243421 is an equidigital number, since it uses as much as digits as its factorization.

418243421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 29.

The square root of 418243421 is about 20451.0004889736. Note that the first 3 decimals coincide. The cubic root of 418243421 is about 747.8417484094.

The spelling of 418243421 in words is "four hundred eighteen million, two hundred forty-three thousand, four hundred twenty-one".