1438381447 has 2 divisors, whose sum is σ = 1438381448. Its totient is φ = 1438381446.

The previous prime is 1438381423. The next prime is 1438381481. The reversal of 1438381447 is 7441838341.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1438381447 - 2⁷ = 1438381319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438385447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719190723 + 719190724.

It is an arithmetic number, because the mean of its divisors is an integer number (719190724).

Almost surely, 2^1438381447 is an apocalyptic number.

1438381447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438381447 is an equidigital number, since it uses as much as digits as its factorization.

1438381447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 43.

The square root of 1438381447 is about 37925.9996176765. Note that the first 3 decimals coincide. The cubic root of 1438381447 is about 1128.8199880731.

The spelling of 1438381447 in words is "one billion, four hundred thirty-eight million, three hundred eighty-one thousand, four hundred forty-seven".