1238499989 has 2 divisors, whose sum is σ = 1238499990. Its totient is φ = 1238499988.

The previous prime is 1238499967. The next prime is 1238499991. The reversal of 1238499989 is 9899948321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1145280964 + 93219025 = 33842^2 + 9655^2 .

It is an emirp because it is prime and its reverse (9899948321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1238499989 - 2²⁸ = 970064533 is a prime.

Together with 1238499991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238499949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619249994 + 619249995.

It is an arithmetic number, because the mean of its divisors is an integer number (619249995).

Almost surely, 2^1238499989 is an apocalyptic number.

It is an amenable number.

1238499989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238499989 is an equidigital number, since it uses as much as digits as its factorization.

1238499989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 62.

The square root of 1238499989 is about 35192.3285532515. The cubic root of 1238499989 is about 1073.9036925827.

The spelling of 1238499989 in words is "one billion, two hundred thirty-eight million, four hundred ninety-nine thousand, nine hundred eighty-nine".