1238448391 has 2 divisors, whose sum is σ = 1238448392. Its totient is φ = 1238448390.

The previous prime is 1238448389. The next prime is 1238448437. The reversal of 1238448391 is 1938448321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1238448391 - 2¹ = 1238448389 is a prime.

Together with 1238448389, 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 (1238448311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619224195 + 619224196.

It is an arithmetic number, because the mean of its divisors is an integer number (619224196).

Almost surely, 2^1238448391 is an apocalyptic number.

1238448391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238448391 is an equidigital number, since it uses as much as digits as its factorization.

1238448391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 1238448391 is about 35191.5954597117. The cubic root of 1238448391 is about 1073.8887788287. Note that the first 3 decimals are identical.

The spelling of 1238448391 in words is "one billion, two hundred thirty-eight million, four hundred forty-eight thousand, three hundred ninety-one".