1438206641 has 2 divisors, whose sum is σ = 1438206642. Its totient is φ = 1438206640.

The previous prime is 1438206607. The next prime is 1438206643. The reversal of 1438206641 is 1466028341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1028549041 + 409657600 = 32071^2 + 20240^2 .

It is an emirp because it is prime and its reverse (1466028341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438206641 is a prime.

It is a Sophie Germain prime.

Together with 1438206643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1438206643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719103320 + 719103321.

It is an arithmetic number, because the mean of its divisors is an integer number (719103321).

Almost surely, 2^1438206641 is an apocalyptic number.

It is an amenable number.

1438206641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438206641 is an equidigital number, since it uses as much as digits as its factorization.

1438206641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1438206641 is about 37923.6949808428. The cubic root of 1438206641 is about 1128.7742578529.

The spelling of 1438206641 in words is "one billion, four hundred thirty-eight million, two hundred six thousand, six hundred forty-one".