1389007849 has 2 divisors, whose sum is σ = 1389007850. Its totient is φ = 1389007848.

The previous prime is 1389007847. The next prime is 1389007889. The reversal of 1389007849 is 9487009831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1186458025 + 202549824 = 34445^2 + 14232^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389007849 - 2¹ = 1389007847 is a prime.

Together with 1389007847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1389007847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694503924 + 694503925.

It is an arithmetic number, because the mean of its divisors is an integer number (694503925).

Almost surely, 2^1389007849 is an apocalyptic number.

It is an amenable number.

1389007849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389007849 is an equidigital number, since it uses as much as digits as its factorization.

1389007849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1389007849 is about 37269.3956081931. The cubic root of 1389007849 is about 1115.7534368881.

The spelling of 1389007849 in words is "one billion, three hundred eighty-nine million, seven thousand, eight hundred forty-nine".