1238039989 has 2 divisors, whose sum is σ = 1238039990. Its totient is φ = 1238039988.

The previous prime is 1238039987. The next prime is 1238040043. The reversal of 1238039989 is 9899308321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013339889 + 224700100 = 31833^2 + 14990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238039989 - 2¹ = 1238039987 is a prime.

Together with 1238039987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238039987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619019994 + 619019995.

It is an arithmetic number, because the mean of its divisors is an integer number (619019995).

Almost surely, 2^1238039989 is an apocalyptic number.

It is an amenable number.

1238039989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238039989 is an equidigital number, since it uses as much as digits as its factorization.

1238039989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 1238039989 is about 35185.7924310367. The cubic root of 1238039989 is about 1073.7707207417.

The spelling of 1238039989 in words is "one billion, two hundred thirty-eight million, thirty-nine thousand, nine hundred eighty-nine".