838338421 has 2 divisors, whose sum is σ = 838338422. Its totient is φ = 838338420.

The previous prime is 838338419. The next prime is 838338443. The reversal of 838338421 is 124833838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636300625 + 202037796 = 25225^2 + 14214^2 .

It is a cyclic number.

It is not a de Polignac number, because 838338421 - 2¹ = 838338419 is a prime.

It is a super-2 number, since 2×838338421² = 1405622616249546482, which contains 22 as substring.

Together with 838338419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838338401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419169210 + 419169211.

It is an arithmetic number, because the mean of its divisors is an integer number (419169211).

Almost surely, 2^838338421 is an apocalyptic number.

It is an amenable number.

838338421 is a deficient number, since it is larger than the sum of its proper divisors (1).

838338421 is an equidigital number, since it uses as much as digits as its factorization.

838338421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 838338421 is about 28954.0743419644. The cubic root of 838338421 is about 942.9162567369.

The spelling of 838338421 in words is "eight hundred thirty-eight million, three hundred thirty-eight thousand, four hundred twenty-one".