1438401673 has 2 divisors, whose sum is σ = 1438401674. Its totient is φ = 1438401672.

The previous prime is 1438401667. The next prime is 1438401683. The reversal of 1438401673 is 3761048341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086163849 + 352237824 = 32957^2 + 18768^2 .

It is an emirp because it is prime and its reverse (3761048341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1438401673 - 2⁵ = 1438401641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438401683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719200836 + 719200837.

It is an arithmetic number, because the mean of its divisors is an integer number (719200837).

Almost surely, 2^1438401673 is an apocalyptic number.

It is an amenable number.

1438401673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438401673 is an equidigital number, since it uses as much as digits as its factorization.

1438401673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 1438401673 is about 37926.2662675882. The cubic root of 1438401673 is about 1128.8252790679.

The spelling of 1438401673 in words is "one billion, four hundred thirty-eight million, four hundred one thousand, six hundred seventy-three".