1389665075 has 6 divisors (see below), whose sum is σ = 1723184724. Its totient is φ = 1111732040.

The previous prime is 1389665071. The next prime is 1389665087. The reversal of 1389665075 is 5705669831.

It is a happy number.

It is not a de Polignac number, because 1389665075 - 2² = 1389665071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389665071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27793277 + ... + 27793326.

It is an arithmetic number, because the mean of its divisors is an integer number (287197454).

Almost surely, 2^1389665075 is an apocalyptic number.

1389665075 is a deficient number, since it is larger than the sum of its proper divisors (333519649).

1389665075 is an equidigital number, since it uses as much as digits as its factorization.

1389665075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55586613 (or 55586608 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 1389665075 is about 37278.2117999241. The cubic root of 1389665075 is about 1115.9293865878.

The spelling of 1389665075 in words is "one billion, three hundred eighty-nine million, six hundred sixty-five thousand, seventy-five".