1438381897 has 2 divisors, whose sum is σ = 1438381898. Its totient is φ = 1438381896.

The previous prime is 1438381837. The next prime is 1438381913. The reversal of 1438381897 is 7981838341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134611856 + 303770041 = 33684^2 + 17429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438381897 - 2¹⁹ = 1437857609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438381837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719190948 + 719190949.

It is an arithmetic number, because the mean of its divisors is an integer number (719190949).

Almost surely, 2^1438381897 is an apocalyptic number.

It is an amenable number.

1438381897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438381897 is an equidigital number, since it uses as much as digits as its factorization.

1438381897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 1438381897 is about 37926.0055502817. The cubic root of 1438381897 is about 1128.8201057908.

The spelling of 1438381897 in words is "one billion, four hundred thirty-eight million, three hundred eighty-one thousand, eight hundred ninety-seven".