1338987047 has 2 divisors, whose sum is σ = 1338987048. Its totient is φ = 1338987046.

The previous prime is 1338987029. The next prime is 1338987053. The reversal of 1338987047 is 7407898331.

It is a strong prime.

It is an emirp because it is prime and its reverse (7407898331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338987047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1338986986 and 1338987004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338987017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669493523 + 669493524.

It is an arithmetic number, because the mean of its divisors is an integer number (669493524).

Almost surely, 2^1338987047 is an apocalyptic number.

1338987047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338987047 is an equidigital number, since it uses as much as digits as its factorization.

1338987047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 1338987047 is about 36592.1719360849. The cubic root of 1338987047 is about 1102.1959018900.

The spelling of 1338987047 in words is "one billion, three hundred thirty-eight million, nine hundred eighty-seven thousand, forty-seven".