71438399 has 2 divisors, whose sum is σ = 71438400. Its totient is φ = 71438398.

The previous prime is 71438387. The next prime is 71438401. The reversal of 71438399 is 99383417.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71438399 - 2¹⁶ = 71372863 is a prime.

Together with 71438401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71438699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35719199 + 35719200.

It is an arithmetic number, because the mean of its divisors is an integer number (35719200).

Almost surely, 2^71438399 is an apocalyptic number.

71438399 is a deficient number, since it is larger than the sum of its proper divisors (1).

71438399 is an equidigital number, since it uses as much as digits as its factorization.

71438399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 71438399 is about 8452.1239342546. The cubic root of 71438399 is about 414.9322945627.

The spelling of 71438399 in words is "seventy-one million, four hundred thirty-eight thousand, three hundred ninety-nine".