1438052809 has 2 divisors, whose sum is σ = 1438052810. Its totient is φ = 1438052808.

The previous prime is 1438052773. The next prime is 1438052813. The reversal of 1438052809 is 9082508341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230606400 + 207446409 = 35080^2 + 14403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438052809 is a prime.

It is a super-3 number, since 3×1438052809³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1438052009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719026404 + 719026405.

It is an arithmetic number, because the mean of its divisors is an integer number (719026405).

Almost surely, 2^1438052809 is an apocalyptic number.

It is an amenable number.

1438052809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438052809 is an equidigital number, since it uses as much as digits as its factorization.

1438052809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1438052809 is about 37921.6667487071. Note that the first 3 decimals coincide. The cubic root of 1438052809 is about 1128.7340114822.

The spelling of 1438052809 in words is "one billion, four hundred thirty-eight million, fifty-two thousand, eight hundred nine".