1389789665 has 24 divisors (see below), whose sum is σ = 1837442880. Its totient is φ = 1008386720.

The previous prime is 1389789641. The next prime is 1389789677. The reversal of 1389789665 is 5669879831.

It is a happy number.

It is not a de Polignac number, because 1389789665 - 2⁶ = 1389789601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1389789598 and 1389789607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280076 + ... + 284994.

It is an arithmetic number, because the mean of its divisors is an integer number (76560120).

Almost surely, 2^1389789665 is an apocalyptic number.

It is an amenable number.

1389789665 is a deficient number, since it is larger than the sum of its proper divisors (447653215).

1389789665 is a wasteful number, since it uses less digits than its factorization.

1389789665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413 (or 5402 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 62.

The square root of 1389789665 is about 37279.8828458460. The cubic root of 1389789665 is about 1115.9627350279.

The spelling of 1389789665 in words is "one billion, three hundred eighty-nine million, seven hundred eighty-nine thousand, six hundred sixty-five".