1438249717 has 2 divisors, whose sum is σ = 1438249718. Its totient is φ = 1438249716.

The previous prime is 1438249661. The next prime is 1438249721. The reversal of 1438249717 is 7179428341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1371517156 + 66732561 = 37034^2 + 8169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438249717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438249117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719124858 + 719124859.

It is an arithmetic number, because the mean of its divisors is an integer number (719124859).

Almost surely, 2^1438249717 is an apocalyptic number.

It is an amenable number.

1438249717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438249717 is an equidigital number, since it uses as much as digits as its factorization.

1438249717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 1438249717 is about 37924.2629064824. The cubic root of 1438249717 is about 1128.7855271177.

The spelling of 1438249717 in words is "one billion, four hundred thirty-eight million, two hundred forty-nine thousand, seven hundred seventeen".