1338635587 has 2 divisors, whose sum is σ = 1338635588. Its totient is φ = 1338635586.

The previous prime is 1338635567. The next prime is 1338635593. The reversal of 1338635587 is 7855368331.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7855368331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1338635587 - 2¹⁵ = 1338602819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1338635587.

It is not a weakly prime, because it can be changed into another prime (1338635567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669317793 + 669317794.

It is an arithmetic number, because the mean of its divisors is an integer number (669317794).

Almost surely, 2^1338635587 is an apocalyptic number.

1338635587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338635587 is an equidigital number, since it uses as much as digits as its factorization.

1338635587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The square root of 1338635587 is about 36587.3692276447. The cubic root of 1338635587 is about 1102.0994579224.

The spelling of 1338635587 in words is "one billion, three hundred thirty-eight million, six hundred thirty-five thousand, five hundred eighty-seven".