1238404421 has 2 divisors, whose sum is σ = 1238404422. Its totient is φ = 1238404420.

The previous prime is 1238404381. The next prime is 1238404441. The reversal of 1238404421 is 1244048321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198890625 + 39513796 = 34625^2 + 6286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1238404421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238404441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619202210 + 619202211.

It is an arithmetic number, because the mean of its divisors is an integer number (619202211).

Almost surely, 2^1238404421 is an apocalyptic number.

It is an amenable number.

1238404421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238404421 is an equidigital number, since it uses as much as digits as its factorization.

1238404421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1238404421 is about 35190.9707311407. The cubic root of 1238404421 is about 1073.8760695255.

The spelling of 1238404421 in words is "one billion, two hundred thirty-eight million, four hundred four thousand, four hundred twenty-one".